Today I opened Beta 16 as normal, and I started flipping through the menus at the top.
Click on “File” and the shortcuts are cut off; the dropdown menu is too narrow. Slide the mouse over to “Edit,” same thing. Slide back to “File,” problem gone. Back to “edit,” problem gone.
Tried this in succession with the other menus, and the FIRST time I click the top item, the drop-down is narrow, and the shortcuts are physically cut off. After that it’s fine.
And I think this might only happen on first loading Scrivener after booting the machine, because after restarting Scrivener, it didn’t happen (Windows keeps a cache of some sort, I think).