Crash of Cubase 8.0.30 when I want to quit

I have just install the 8.0.30 update of cubase 8 pro 64 bits on Windows 8.1 64bits / 32 Gb ram / I7 processor / SSD drives.

Now Cubase crash sometimes when I want to switch to another application with the taskbar (Windows explorer by example) or to Quit (with or without a project loaded).

I have the report of BEX64 event on cubase8.exe application and “waveshell.dll unload” message.

Sometimes I have also a message about video player (but I only work with audio and midi tracks).