For the past few days (since the new profile pages came out, I think), each time I try to post an answer on U&L, I get this dialog when I click on "Post your answer":
If I choose "Stay on page" and try to submit my answer again, I get the new answers notification banner:
And attempting to submit again, I am told my answer is a dupe since, apparently, it was actually submitted on my first attempt:
As I just found out when posting this question, I get the same issue when posting questions (at least on meta) as well. Choosing to "Leave page" submits the question (and, presumably the answer) as expected but this is very annoying.
Clearing my browser's cache lets me post one answer normally but the next time I try to post, I get the same issue again.
This is on Firefox 37.0 on a 64bit Debian (LMDE). What gives?