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Inbox sub-folders disappear

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When starting Thunderbird up in the last few says, my inbox sub-folders (of which I have many) do not appear. Upon re-starting Thunderbird, they usually appear again. Relieved to have them back, but I how can I get the program to act right?

When starting Thunderbird up in the last few says, my inbox sub-folders (of which I have many) do not appear. Upon re-starting Thunderbird, they usually appear again. Relieved to have them back, but I how can I get the program to act right?

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Do you have an anti virus program? My guess would head in that direction as to the issue cause.

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I have the Norton anti-virus program, but I see nothing there of any relevance to this problem, which now occurs each and every time I open Thunderbird - most of my subfolders are not there, and upon re-booting the program, they come back. Another weird problem occurring is there a sub-folder I wish to delete, and the program won't let me delete it. Don't know if that's related to the first problem.