During the triage yesterday, we sorted out the bugs marked as 1.19 regressions and scheduled them to be fixed before the roll outs on Monday or Wednesday. Anyone who is interested in the results of the triage should check the etherpad: http://etherpad.wikimedia.org/119triage
Today, a 1.19 regression with ProofreadPage was reported. Since we didn't discuss this one yesterday, I'm going to post it here.
Side-by-side functionality broken in Chrome and possibly some Internet Explorer http://bugzilla.wikimedia.org/34706
Following the update to 1.19wmf1 English Wikisource has a break in the side by side viewing of text and image. This basically prevents all use of affected browsers from this functionality.