1) Ran Registry Cleaner (normal mode) - Normal (Options)
Several items after scan in Cleaner window > Fixed
2) Closed window - without leaving PT ran Registry Cleaner again (reference mode) - Aggressive (options)
Nothing showed up in cleaner window, although scan report tells me that there are 10 medium errors
Closed scan report > cleaner window is empty (even no grid lines)
3) Left jv16PT - ran registry cleaner again (reference mode- - aggressive (options)
Now everything OK > the 10 medium errors are shown now in the cleaner window
Tried that several times > each time same error takes place.
Conclusion: bug? after running Registry Cleaner and fixing errors and running again without leaving, there's an error in the cleaner window > nothing is shown even no lines - after leaving PT and rerunning > OK