The other night I copied 4 measures to double the chorus with ripple edit all on. Went well.
Saved the file and quit for the night.
The next night I was doing a vox track. I screwed up and split the vox at the part before the mistake, highlit the bad down stream clip and hit the delete key to wipe it out. Backed up and tried singing that part again. When I came to where the split happened the music changed to a part that was not correct. What? I played it again. Bad. so I ctrl-z'ed my delete and saw both the vox clip come back but also saw the back tracks undo something too. It played ok now.
 
I sat there for a second staring at the gui when it hit me.
Turned off the ripple editing that was turned on from the day before and continued on.
 
Darn it.

sounds like ripple-edit-mode functions aren't registering in the history correctly? it could be connected to older similar
history-related bugs

Ha I fall prey to this too, as well as forgetting that "select envelope with clips" is turned on. Yep we could have really done with clear indicators of these functions being on/off instead of being buried in menus.

A custom cursor overlay on the mouse pointer that says "Hey moron" to clue us in that we left something on would be good.

Don't even get me started on offset mode. 

offset mode tripped me up so many times 

Ha ha.. Offset mode is the number one party trick, takes me by surprise every time..
 

I always said that when offset mode is engaged, a huge  "BEWARE - OFFSET MODE" message should flash right in the middle of the screen. 72pt font or something like that. Bright yellow. 

Offset mode does have an indicator.

Anderton
Offset mode does have an indicator.

A very small one, which is easy to miss if you're not looking for it.