When I try to open any ebook on Calibre, the viewer program starts with a blank pop-up screen.
After a few moments the header displays " Not Responding"
Then, when I force the viewer to stop (click on the top-right X) another windows pops up with "calibre-parallel.exe not responding".
I've seen similar messages in this forum from years ago, but I can't find a solution.
My calibreversion is 4.13
any tips please?
