I had closed a couple of tabs then opened Test 5.1 Note, clicked on the first entry (NKJV text...) when Logos crashed.
3733.LogosNoteCrash.zip
I couldn't reproduce, though.
I have passed you logs on to Development.
This may be related to the WPF font cache; if it happens again, please try clearing the font cache using the instructions here: http://wiki.logos.com/Logos_4_Windows_Is_Hanging_Right_After_Startup