So, this seems to be a thing: Something i'm doing in this patch/system of patches I've been working on for the last year or so keeps making the canvas switch into edit mode automatically, including right when I open it up in which case the window gives no indication of actually being in edit mode--I had to go turn it on in the edit menu first because it's not reporting being in edit mode there either, before I can turn it off. It's possible that I could have been able to toggle it off from the keyboard menu, I didn't really think to try because I was confused as to what was happening as I couldn't see any indication that edit mode was on, yet I kept resizing/breaking gop and data structure canvases whenever I'd click on anything.
My patch is way too big and confusing to share, but it seems to be somehow related to messages sent from various subpatches/abstractions when whatever task is being performed inside is completed. I don't have the time to try to figure anything out right now, and my attempts to do so in the last hour or so kept on getting foiled by PD crashing periodically. That could be related to externals I'm using or something, maybe, but the automatic switching into edit mode seemed to be originating from something more Vanilla.
To avoid any further outbursts directed against the mouse or keyboard, I've switched back to 0.48-2 and things are working normally again, but if need be I could try to pinpoint the source of the issues some more--preferably with some sort of hint as to what I should be looking for--when I get back home later today.