Using ElvUI so not sure if that has any bearing... but when I open my mailbox, the Inbox/Send windows are not movable. When I try and move it it kinda freaks out, goes blank, and then all the text in it disappears. Here are before/after screenshots of trying to drag the inbox...

BEFORE:

AFTER:

Hope that helps!

Hi @webdevdave - Thanks for letting me know. My guess is it is likely related to ElvUI. I will need to investigate further.

This is fixed in Drift v2.1.1.