OK I have found the file - we use a different location for OpenLP's data files so the Tools- Open Data Folder and navigate up one folder didn't work. I had to navigate to %appdata%\OpenLP
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I'm running Windows 8.1 Pro and have reproduced the bug with 2.1.3.
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There is no error message on the screen just a busy cursor and an application is not responding message from windows when I try to close OpenLP from the Close window.
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The debug file is here:
<font face="Arial, Verdana">http://pastebin.com/u9yH28qb</span></font><br></div><div><font face="Arial, Verdana"><br></font>