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open lp not switching slides with arrow keys

having an issue switching slides, images work fine multiple slides do not, i either need to blank the projected image and then play the slide,  or go down to slide 2 then back up, it worked fine untill i upgraded to 2.4, any advice? 

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Debug Trace

Notice
Cannot assign an empty string to a string offset

#0 /var/www/html/library/core/class.format.php(1883): gdn_ErrorHandler(2, 'Cannot assign a...', '/var/www/html/l...', 1883, Array)
#1 /var/www/html/library/core/class.format.php(1219): Gdn_Format::formatMentionsCallback('')
#2 /var/www/html/library/core/class.format.php(1966): Gdn_Format::tagContent('@squidbilly Are...', 'Gdn_Format::for...')
#3 /var/www/html/library/core/class.format.php(1848): Gdn_Format::mentions('@squidbilly Are...')
#4 /var/www/html/library/core/class.format.php(2445): Gdn_Format::processHTML('@squidbilly Are...')
#5 /var/www/html/library/core/class.format.php(2198): Gdn_Format::wysiwyg('@squidbilly Are...')
#6 /var/www/html/themes/Ninja/views/discussion/helper_functions.php(24): Gdn_Format::to('@squidbilly Are...', 'Wysiwyg')
#7 /var/www/html/themes/Ninja/views/discussion/helper_functions.php(174): formatBody(Object(stdClass))
#8 /var/www/html/applications/vanilla/views/discussion/comments.php(19): writeComment(Object(stdClass), Object(DiscussionController), Object(Gdn_Session), 5)
#9 /var/www/html/applications/vanilla/views/discussion/index.php(53): include('/var/www/html/a...')
#10 /var/www/html/library/core/class.controller.php(718): include('/var/www/html/a...')
#11 /var/www/html/library/core/class.controller.php(1316): Gdn_Controller->fetchView('', false, false)
#12 /var/www/html/library/core/class.pluggable.php(210): Gdn_Controller->xRender()
#13 /var/www/html/applications/vanilla/controllers/class.discussioncontroller.php(279): Gdn_Pluggable->__call('render', Array)
#14 /var/www/html/library/core/class.dispatcher.php(845): DiscussionController->index('3362', 'open-lp-not-swi...', '')
#15 /var/www/html/library/core/class.dispatcher.php(274): Gdn_Dispatcher->dispatchController(Object(Gdn_Request), Array)
#16 /var/www/html/index.php(29): Gdn_Dispatcher->dispatch()
#17 {main}
Notice
Cannot assign an empty string to a string offset

#0 /var/www/html/library/core/class.format.php(1883): gdn_ErrorHandler(2, 'Cannot assign a...', '/var/www/html/l...', 1883, Array)
#1 /var/www/html/library/core/class.format.php(1219): Gdn_Format::formatMentionsCallback('')
#2 /var/www/html/library/core/class.format.php(1966): Gdn_Format::tagContent('@raoul <br />Ye...', 'Gdn_Format::for...')
#3 /var/www/html/library/core/class.format.php(1848): Gdn_Format::mentions('@raoul <br />Ye...')
#4 /var/www/html/library/core/class.format.php(2445): Gdn_Format::processHTML('@raoul <br />Ye...')
#5 /var/www/html/library/core/class.format.php(2198): Gdn_Format::wysiwyg('@raoul <br>Yes,...')
#6 /var/www/html/themes/Ninja/views/discussion/helper_functions.php(24): Gdn_Format::to('@raoul <br>Yes,...', 'Wysiwyg')
#7 /var/www/html/themes/Ninja/views/discussion/helper_functions.php(174): formatBody(Object(stdClass))
#8 /var/www/html/applications/vanilla/views/discussion/comments.php(19): writeComment(Object(stdClass), Object(DiscussionController), Object(Gdn_Session), 6)
#9 /var/www/html/applications/vanilla/views/discussion/index.php(53): include('/var/www/html/a...')
#10 /var/www/html/library/core/class.controller.php(718): include('/var/www/html/a...')
#11 /var/www/html/library/core/class.controller.php(1316): Gdn_Controller->fetchView('', false, false)
#12 /var/www/html/library/core/class.pluggable.php(210): Gdn_Controller->xRender()
#13 /var/www/html/applications/vanilla/controllers/class.discussioncontroller.php(279): Gdn_Pluggable->__call('render', Array)
#14 /var/www/html/library/core/class.dispatcher.php(845): DiscussionController->index('3362', 'open-lp-not-swi...', '')
#15 /var/www/html/library/core/class.dispatcher.php(274): Gdn_Dispatcher->dispatchController(Object(Gdn_Request), Array)
#16 /var/www/html/index.php(29): Gdn_Dispatcher->dispatch()
#17 {main}
Notice
Cannot assign an empty string to a string offset

#0 /var/www/html/library/core/class.format.php(1883): gdn_ErrorHandler(2, 'Cannot assign a...', '/var/www/html/l...', 1883, Array)
#1 /var/www/html/library/core/class.format.php(1219): Gdn_Format::formatMentionsCallback('')
#2 /var/www/html/library/core/class.format.php(1966): Gdn_Format::tagContent('@VintageJim <br...', 'Gdn_Format::for...')
#3 /var/www/html/library/core/class.format.php(1848): Gdn_Format::mentions('@VintageJim <br...')
#4 /var/www/html/library/core/class.format.php(2445): Gdn_Format::processHTML('@VintageJim <br...')
#5 /var/www/html/library/core/class.format.php(2198): Gdn_Format::wysiwyg('@VintageJim <br...')
#6 /var/www/html/themes/Ninja/views/discussion/helper_functions.php(24): Gdn_Format::to('@VintageJim <br...', 'Wysiwyg')
#7 /var/www/html/themes/Ninja/views/discussion/helper_functions.php(174): formatBody(Object(stdClass))
#8 /var/www/html/applications/vanilla/views/discussion/comments.php(19): writeComment(Object(stdClass), Object(DiscussionController), Object(Gdn_Session), 8)
#9 /var/www/html/applications/vanilla/views/discussion/index.php(53): include('/var/www/html/a...')
#10 /var/www/html/library/core/class.controller.php(718): include('/var/www/html/a...')
#11 /var/www/html/library/core/class.controller.php(1316): Gdn_Controller->fetchView('', false, false)
#12 /var/www/html/library/core/class.pluggable.php(210): Gdn_Controller->xRender()
#13 /var/www/html/applications/vanilla/controllers/class.discussioncontroller.php(279): Gdn_Pluggable->__call('render', Array)
#14 /var/www/html/library/core/class.dispatcher.php(845): DiscussionController->index('3362', 'open-lp-not-swi...', '')
#15 /var/www/html/library/core/class.dispatcher.php(274): Gdn_Dispatcher->dispatchController(Object(Gdn_Request), Array)
#16 /var/www/html/index.php(29): Gdn_Dispatcher->dispatch()
#17 {main}
Notice
Cannot assign an empty string to a string offset

#0 /var/www/html/library/core/class.format.php(1883): gdn_ErrorHandler(2, 'Cannot assign a...', '/var/www/html/l...', 1883, Array)
#1 /var/www/html/library/core/class.format.php(1219): Gdn_Format::formatMentionsCallback('')
#2 /var/www/html/library/core/class.format.php(1966): Gdn_Format::tagContent('@squidbilly can...', 'Gdn_Format::for...')
#3 /var/www/html/library/core/class.format.php(1848): Gdn_Format::mentions('@squidbilly can...')
#4 /var/www/html/library/core/class.format.php(2445): Gdn_Format::processHTML('@squidbilly can...')
#5 /var/www/html/library/core/class.format.php(2198): Gdn_Format::wysiwyg('@squidbilly can...')
#6 /var/www/html/themes/Ninja/views/discussion/helper_functions.php(24): Gdn_Format::to('@squidbilly can...', 'Wysiwyg')
#7 /var/www/html/themes/Ninja/views/discussion/helper_functions.php(174): formatBody(Object(stdClass))
#8 /var/www/html/applications/vanilla/views/discussion/comments.php(19): writeComment(Object(stdClass), Object(DiscussionController), Object(Gdn_Session), 9)
#9 /var/www/html/applications/vanilla/views/discussion/index.php(53): include('/var/www/html/a...')
#10 /var/www/html/library/core/class.controller.php(718): include('/var/www/html/a...')
#11 /var/www/html/library/core/class.controller.php(1316): Gdn_Controller->fetchView('', false, false)
#12 /var/www/html/library/core/class.pluggable.php(210): Gdn_Controller->xRender()
#13 /var/www/html/applications/vanilla/controllers/class.discussioncontroller.php(279): Gdn_Pluggable->__call('render', Array)
#14 /var/www/html/library/core/class.dispatcher.php(845): DiscussionController->index('3362', 'open-lp-not-swi...', '')
#15 /var/www/html/library/core/class.dispatcher.php(274): Gdn_Dispatcher->dispatchController(Object(Gdn_Request), Array)
#16 /var/www/html/index.php(29): Gdn_Dispatcher->dispatch()
#17 {main}