I tried out on factory settings and it works. Probably troubles in exported settings from 2.80. Sorry about that! Please close this task.

I solved this problem by saving new input preset in preferences in 2.80. I didn't thought about this before. Quick Favorites lost at all.

Thank you!

But I customized 2.80 for a long time from factory settings. Could you explain me please how I can to import my big blender input list to 2.81?

Looks like in RC3 this is not appear anymore

System Information
Operating system: Linux-4.15.0-54-generic-x86_64-with-debian-stretch-sid 64 Bits
Graphics card: GeForce GTX 1050 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 418.56

All the same... Alt+Z = working bad, X-Ray in interface - working well. Try to switch on both of this: alt+z and press button from top bar and vice versa.
Looks like blender have 2 X-Rays.

In T64990#685364, @Jacques Lucke (JacquesLucke) wrote:

I don't think this is a bug currently, that is just how it works for now.

I installed driver version 418.56 and my tests does not provocative any crashes now. Looks like now it runs very well. Thanks a lot for help!

In T64040#669691, @Sebastian Parborg (zeddb) wrote:

I can not reproduce this on my end. Could you try the latest blender beta?