This was in the Beta 3 update, if you check the Best Fit checkbox for a text item, it doesn’t resize the text. Just remains it’s current size even though it has plenty of room to expand, also reducing the area to smaller than the text no longer shrinks the text.
I created bug case 713472 for this.
I’ve reproduced this and am investigating.
Yep. Messed up all my GUIs. Any estimate for when the next patch / beta will launch? We are bringing a build to Gamescom and I’d like to know if I can keep working with 5.2 or I’ve got to roll back to 5.1.
Fix will be in Beta 5, it missed the cuttoff for beta 4 ;(
I’ll wait for Beta 5. Thanks a lot Tim 
Has this issue been fixed yet? I’m experiencing it as well, and it broke all of the UI text in my game.
There was a merge error going to RC1. RC2 should address this.
I noticed in some cases, the size either did not update at all and/or the text was not visible as well – perhaps, the merged code needs a manual review. Looking forward to updates!