No fix, but the behaviour of the box itself is now normal in beta 3 (no weird tooltips duplication), which makes it all the more disappointing when it still does crash on save :/Photoshop CC is working fine otherwise. But with 1 crash happening specifically when you go for "Save for Web" option. Just when you click save on the "Save for web" dialog box. Photoshop vanishes/ crashes. Normal save/ save as.. is working fine. This problem is happening with the latest Photoshop CC 2015.5 version on Mac Sierra Beta 2.
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Hey, even I face the same save for Web problem in beta 2. Just after I updated photoshop to 2015.5 version. Did you find any fix? I wrote 2 crash reports to Adobe but none answered.
It looks like Apple is aware of it as it keeps improving between betas somehow.