As of this morning, OpenLP hangs on the splash screen/logo when trying to start on my service creation machine. Only change since last week that I'm aware of is installing a Canon printer, but I tried uninstalling that and it didn't help.
Win 8.1 x64 (all up to date)
Powerpoint 2013 ("click-to-run" version 15.0.4551.1512)
OpenLP ran fine last week. I tried reinstalling OpenLP but it didn't help.
logfile (good for 2 weeks): http://pastebin.com/q3pWbxvw