Mouse wheel stops working

Good evening folks,
i’m using the last beta 8.0.2646.
I have a logitech mouse which works flawlessy in other programs.(no logitech software in the background)
In emclient 8 beta, happens almost twice a day, the wheel stops responding.
To be more clear:
Going back and forth many times from the mail list window to the preview window and back, the mousewheel stops working. The only way the get the wheel back at work is to exit and start emclient again.
Mouse works with no problems in all my other programs.
Cheers to you all. :it: