Another problem that's gotten much more prominent since I went to 5.0.18 (from .9) occurs when I hit send on a message: the command bar greys out... but the message never a) goes, nor b) ends up in Drafts (unless I've manually put it there).
I can usually copy out the text, and redo the send/reply, and hitting F5 before I start a reply is a 100% reliable prophylactic.
I infer JS corruption, but it's probably gonna be difficult to pin down. Happens regardless the speed of the link between the WS and the server.
Anyone else seeing this? It's about a 15% or so probability, it seems to me. Maybe a touch lower.