So looking at one example as I'm sure the root cause is the same, the buttons in toolbar not showing all the time. Is this reproducible in a small test case? I know you said it's random but does it happen in a small test?
I've been using the nightly builds and I can say that, at least for me, the issue with Chrome 18/19, was resolved on the latests builds of Feb. I don't know which build was beta3 based on... (haven't used the official releases sin the nightly builds are available)
The problem with toolbar buttons "disappearing" (the markup is there but the width was set to 0px) and grid columns losing its "flex" (the columns where shrinking to the left), and the problem with charts legend stuck on the upper left, where happening constantly on my end... and I also could reproduce then toolbar/grid problems on the theme example of the different builds.... (it was a matter of resizing the window just a few times, sorting on some grids, or resizing a panel a few times... sometimes it happened on the first window resize, sometimes it happened after a lot of tries, it was a really rare and random bug...)
I had to move to chrome stable (still using it), but now I'm constantly testing with google canary, so, at least with the builds from the 27-28 of Feb and Canary (19.0.1064.0 canary) the problem seems to be fixed.
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