I have passed your logs on to Development.
L5 (5.1 B6 on Windows 8) crashed on closing Library window
Graham Criddle
MVP Posts: 33,247 
After updating some metadata (tags, ratings) in a floating library window I closed the window - and Logos crashed.
Logs below:
Graham
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Comments
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I have passed your logs on to Development.
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Thanks Kelly
Appreciated, Graham
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This will be fixed in 5.1 Beta 9.
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