I'm getting this whenever I try to add a new Google account into the contacts resource: libGL error: failed to create drawable Build from sources a few minuts ago, Qt 5.8-git (to be 5.8.1) Cheers!
I'm seeing some crashes too, looks like a bug in QtWebEngine.
I have the same issue with arch linux 64 bit packages qt5 5.8.0. (qt5-webengine-5.8.0-8). Using r600g driver with mesa git (17.2.0-devel). This is printed on the console, and the window is just 'blank' and cannot be interacted with: libGL error: failed to create drawable
This problem was solved for me on Arch Linux by rebuilding the libkgapi and kdepim-runtime packages. Not sure if both needs to be rebuilt, but it didn't work with only rebuilding libkgapi.
This sounds like an issue with GPU drivers or something similar, nothing we can do about it here, sorry.