I see that top.exe show that thunderbird.exe (38.6.0) is running, hard kill fail. And restart the system, open the previous ver 31.8.0 , and show 2 ico in the upper right corner, and when move in folders only displays the contents of one folder. Close it, restart and all is ok. But this is with ver 31.8.0
I have a problem with this version with one mail from only one customer, that close the thunderbird.
Saludos