Using CCleaner free v5.28.6005 (64-bit), it stops somewhere near the various Store apps and just gives
a "CCleaner stopped working" dialog. No error code or other message, not a crash. Is there some
log function I can turn on to see exactly where it's failing, and send that to Piriform ?
Try running ccleaner with debug switch and upload log here (you may need to zip it first) or copy and paste relevant area when it stops working.
http://www.piriform.com/docs/ccleaner/troubleshooting/running-ccleaner-in-debug-mode
Also if you have firefox uncheck
Mozilla -> compact databases
Unchecking "Mozilla -> compact databases" fixed the problem, thanks.
This should be fixed in the next version, they developers are looking into it