Users started reporting that they can't quote since upgrading to IE11, I was able to confirm this myself. I'm still running XF1.1.5 (can't upgrade yet due to the amount of style changes needed to go to 1.2). Any fix for this? I'm willing to do it myself.
There shouldn't be, but it's not known. 1.2 doesn't have any confirmed IE11 issues (there have been some reports of challenges with the editor, but I haven't reproduced that and I'm unsure I can do much about it as is).