Trigger

On two occasions over the past three weeks I have run CCleaner only to find that immediately after running it my all files and folders in my email application Mozilla Thunderbird have disappeared. I finally found how to recreate all my files and folders but I don't need this aggravation. Are you aware of any similar reports and if so how may I prevent this from happening again. Thunderbird is not listed as an app. on the side menu of CCleaner, so cannot be unchecked. Thanks Trigger