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Custom Toolbars Disappear Intermittently

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For a long time I had two custom toolbars that I used instead of the Mail Toolbar. I found that sometimes the custom toolbars were not displayed when Thunderbird started. Restarting Thunderbird a time or two fixed the problem, especially if I turned on the Mail Toolbar. Just recently, I moved the icons from one of my custom toolbars to the mail toolbar to see if having the mail toolbar on all the time would help. It didn't (the Mail Toolbar is always displayed, however). Quite some time ago I took someone's suggestion and created a new profile (well, almost new; I copied a few things over, but not option settings). That was a fair amount of work and didn't solve the problem. I'm using Thunderbird 52.8.0 (US version) on Windows 10 Pro, 64 bit, build 16299. Any ideas?

For a long time I had two custom toolbars that I used instead of the Mail Toolbar. I found that sometimes the custom toolbars were not displayed when Thunderbird started. Restarting Thunderbird a time or two fixed the problem, especially if I turned on the Mail Toolbar. Just recently, I moved the icons from one of my custom toolbars to the mail toolbar to see if having the mail toolbar on all the time would help. It didn't (the Mail Toolbar is always displayed, however). Quite some time ago I took someone's suggestion and created a new profile (well, almost new; I copied a few things over, but not option settings). That was a fair amount of work and didn't solve the problem. I'm using Thunderbird 52.8.0 (US version) on Windows 10 Pro, 64 bit, build 16299. Any ideas?

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toolbars are stores in a session file that ccleaner routinely deleted isf you do not modify it's default. It might not be the only "cleaner" to clean far too much

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Thanks for the suggestion. I have CCleaner now, but did not when the problem started. As for other cleaners, I try to not let cleaners run automatically, as I do not want things deleted without my knowing about it. Also, when I restart Thunderbird a couple of times, the toolbars reappear with all icons intact, so they clearly were not actually deleted.