My folders have disappeared?

All of my folders disappeared. If I add one, it doesn't show up, but I can see the new ones and old ones on my iPad and iPhone. If I click the arrow, all that shows are two parentheses (). I can search for an email and the search brings back emails in those folders, but they aren't visibible. I can't figure out how to get them back and there doesn't seem to be any kind of support specific for this. Also… Does Yahoo! Have some kind of customer support number?

Try logging in again. This has just worked for me. I have noticed recently that mail quite often stops working for no apparent reason, and then works when I log in again.

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