It has been quite a while since the last post on this topic, but I’d like to reopen it due to having the same exact issue. No previous download on my Windows 10 machine, have replicated all tips given to no prevail. Running as regular/administrator user doesn’t change the outcome, and neither does clearing any temp files. I’ve run both MSERT (who I’ve found most reliable in discovering hidden viruses) & herdProtect (mass program virus scanner) antivirus scans, so I can assure you this isn’t some type of malicious download or backdoor on the computer. As for replicating the problem, it’s hard to explain since it seems to be a very rare issue: I simply click on CCleaner to start it up, and it replicates the instance a seemingly infinite amount of times. The most peculiar thing about it is that Task Manager doesn’t group the instance together as it does with other programs; they are all listed separately. I’ve attached a video (sorry for the bad crop) demonstrating this issue, though the window duplication was much slower due to me recording.
CCleaner Bug Showcase.mp4
