There is one problem that worries me, 1.4 came out with a known (for few RC's and 2-3 releases before) regression that makes Photoshop CS5 unusable - not sure about older ones too but it might also be the case :(
latest test entry is mentioning that - i also encountered it - before i used last stable from fedora - that worked well. I would have to dig buzilla for reports, but i wouldnt be surprised if there are no reports for it.
Yeah, the chances of a regression being fixed increase massively if you do a regression test to bisect the offending commit and file a bug on Bugzilla.
