I'm going to have to half-disable our Chrome autofill background color fix code. There seems to be a change where the autofill password isn't available to JS in all cases. I suspect it may be related to user interaction.
The autofill fix also created potentially strange bugs due to the method it needs to use (element cloning), along with the fact that it has to run after the window.load event, which means there could be references held to the old value. As such, we're no only using this in the login form (where the yellow is very obvious in the default code).
This all stems out of a 4+ year old bug where Chrome forces autofill fields to yellow. As such, you're probably going to see more yellow. It's worth noting that this was originally done because Chrome forced a yellow background but didn't change the text color, so you ended up with white text on yellow in the login bar. They have since fixed this part.
This issue was mostly fixed in RC2. Most parts of the XenForo site (including non-forum areas) share a common codebase (albeit some of it somewhat outdated) so in theory the same or similar fix should be able to be rolled out there too. I was just asking if that was the case.