Here is a test version 1.9.0.584. It contains these bug fixes and improvements to the debugging system made in order to fix the problem of the Registry Cleaner freezing before completing the scan. So, if you experience the problem of the Registry Cleaner not ever finishing, please create a debug log and send it to this thread.
This version is released here for testing because of the large number of changes (bug fixes), and because a few issues that were not yet fixed (Registry Cleaner hanging on some systems). The final version will be released after these issues have been solved, hopefully within a week.