This is an error that I have brought up before, though I did not report it as a bug at the time, but I have encountered it again and it appears to still exist here on xenforo.com. This is the old thread:
The referenced test thread still does not work with my current version of Chrome: Version 31.0.1650.63 m
We have had a user report this issue on a thread for a board where I manage the server. This board is still on xenForo 1.1, so it appears to be an issue in both 1.1 and 1.2. This is the reported thread:
The thread here on xenforo.com had a few replies starting to get at the issue, but I am not enough of web coding guy to know what kind of validation error there is here. Any help would be great.