SketchUp M2 - Browse for texture problem !!

[derei]

I just had a nasty problem with SU8 M2 .. I wanted to change the texture for a material, I clicked on Browse button (that little folder), but no window has opened, instead I heard that "ding" every time I was clicking anywhere on the screen, like it was telling me that I have a modal window opened.
It happened once, I have no idea how to reproduce it, but is not the only strange thing that I encountered since that update... it looks like it became unstable.