<p>First of all, are you running as an admin user or standard user? If the latter, you may have more joy with an admin user.</p>
<p>A workaround until the real issue can be solved is to try doing a File -> Save as, and giving the amended file a new name and seeing what happens.</p>
<p>As for the cause:</p>
<p>Are you saving the OOS files to your Documents folder, rather than somewhere outside the normal saved places? I'm wondering if it's a permissions issue. I see you are even having trouble with brand new OOS's, which seems a bit odd. Maybe anti-virus software? The software doesn't use Java and I don't think a Windows Update would affect things.</p>
<p>Vista/Windows 7 also have a thing called compatibility files, which if a program doesn't have permission to change a file, it creates a copy that can be edited. To see if this is the case, browse to the folder where you are saving the OOS and see if there is a "Compatibility Files" button underneath the address bar in explorer. If so, then OpenLP may be getting confused as to which one to write to.</p>
<p>The openlp registry settings are unlikely to affect the saving of files, as are anything in the data files, but if you really wanted to completely clear everything down (lose your song database, bibles, themes), do a normal uninstall first.</p>
<p>Then go into regedit and delete the tree: HKEY_CURRENT_USER\Software\openlp.org</p>
<p>Delete the data files are in C:\ProgramData\openlp.orgDelete the program files in C:\Program Files\openlp.org</p>
<p>Also check for compatibility files for these folders. If the button appears, click it and delete any files that may appear.</p>
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