Never used a forum post before, so please excuse if this format is wrong in replying. and apologoes for the long post.
I am using CCleaner v.1.17.090 and after a lot of testing found out that the combination that causes CCleaner to shutdown, not clean the selected items, or remember selection changes, occurs when BOTH Autocomplete Form History and Recent Document History are selected. All other item selections/combinations are irrelevant. If these items were not both selected and then you select both, if you then directly press the Run Cleaner button, you will find that it will work correctly (and continue to work correctly while you click on the Run Cleaner button, until you exit the program and then run CCleaner again, then it fails to work correctly and shuts down when clicking on the Run Cleaner button.
Also if you find you have these two items selected and you deselect either one or even both of them and then click the Run Cleaner button, the programs shuts down and loses your selection changes you made prior to pressing this button.
To effect the change you need to deselect either one or both of the above mention items (and make any other changes you desire), and then press the Exit button. This then correctly saves the changes you have made, thus ensuring that both Autocomplete Form History and Recent Document History are NOT simultaneously selected, which then ensure correct operation of CCleaner, instead of it just shutting down and doing nothing and forgetting any item selection changes.
Making Option changes does get remembered correctly even if the program subsequently closes when pressing the Run Cleaner button.
Here endeth the info.
Hope this helps in quickly fixing this bug.
Many thanks for a great program.
Could you include a shredder option to specify the byte/bytes data that you want to overwrite the deleted files with, and the number of shred times you want to repeat doing this. Also include a random key generator option, where you just specify the number of bytes length and number of shreds, for all the really paranoid users out there.