Every so often I receive below error when saving an alias editing. Win 8.1(64), newest Firefox (59.0-64bit):
You backtracked too far.
The application backtracking limit of 30 has been exceeded.
Also clicking on "How to format you text" button does nothing for me.
Should add that today is the first time I've tried making an alias. So have no before hand knowledge.
I've gotten that error a few times, even on the old website. Would happen randomly clicking throughout the store or making repeated posts on the forums.
I think it triggers when you visit the same page too many times in short succession.
Your bottom part seems to make sense. I had a bunch of other people's aliases open to copy formatting. After my original post I closed all those aliases and didn't have any other problems afterwards.