Hi,
I was switching tasks in between CB and a Cygwin shell when this window appeared. I had 2 projects opened (1 large and a small one). RPT didn't contained anything.
Selecting Continue seems to have no effect.
From the about:
CB svn 11428 Build: May 10 2018, 18:09:35 - wx3.1.1 (Windows, unicode) - 64 bit
Running Windows 7 Professionnal SP 1.