It is a detection by heuristics.Did you set the Heuristics of CIS to high? That is not recommended as it makes CIS awfully chatty. What happens when you set Heuristics to the default low?
3)Are you talking about the result screen you get after a manual scan? You can select individual files using the checkbox
4)Sounds like the scanner may have crashed. Are you willing to report this as a bug?
Please file a bug report in the Bug Reports - CIS
board following the format as described in FORMAT & GUIDE - just COPY/PASTE it!
Also follow How to determine which file is causing a manual scan to hang
to determine what file was causing the scanner to be hung. Please add this information to your bug report.