STR (1) Load settings app (2) Tap "Device Information" (3) Tap "More Information" (4) Tap down on "Mac Address", quickly slide your finger straight down outside the box, then lift your finger off. At the beginning of step (4), the background for "Mac Address" is highlighted, but at the end, it's not unhighlighted. This might be a dlbi regression, but I may have seen this before dlbi. Will whip up a build right quick to check. blocking+ because there are some related-looking bugs in the settings app that are resulting in text rendering being corrupted.

I can reproduce this without dlbi. Likely an event-handling problem.

Similar but not identical problem with the wifi settings -- when you connect to an AP, you often end up with garbled/overlaid text as two things are drawn on top of eachother as a result of the status change. Often times entries will repaint without clearing below, so that the text gets jankier/bolder if it's the same entry, or garbled if something got sorted differently.

That last comment is 100% definitely bug 793840.

Is it a Gaia issue?

It's not clear yet whether the bug described in comment 0 is a gaia or gecko problem. Most likely it's a gecko problem. The bug described in comment 2 (bug 793840) is almost certainly a gecko problem.

bug 796786, bug 797122 there are a bunch of invalidation issues.