This is with Logos 6.4 RC1 on Windows 8.1 (when I get the chance I will upgrade to 6.4 RC2 and see if anything changes)
I was trying to create a custom reading plan for Brueggemann's "Israel's Praise" and Logos crashed. I had highlighted pages 1-11 and was dragging the selection to the "drag a shortcut here" section in the Reading Plan editor.
(The Reading Plan editor window was on a separate monitor but I have moved it across to the main monitor for the screenshot)

This is repeatable
Log files attached:
4403.Logos.log
3757.LogosCrash.txt
Thanks, Graham