Latest Beta 18 - Win7Pro 64 bit.
For the last few days after I've shut NBPro down, when I go to start it up again with the desktop icon nothing happens. When I open Task manager up, it shows NBPro is still running even after 5 hours from the previous session. I end the process and can then start NBPro up again.
It doesn't happen every time but maybe 6 times out of the last dozen starts.
I noticed after the last time that there were 2 files in the Failed Download list which I had downloaded in the last session of NBPro 3 hours previously - I don't know if this has any significance.