I have installed the bionic-proposed updates and worked for imap
connections to imap.mail.yahoo.com on port 993.
Updated the next packages with Synaptic:
libgnutls-openssl27 (3.5.18-1ubuntu1.3) to 3.5.18-1ubuntu1.4
libgnutls30 (3.5.18-1ubuntu1.3) to 3.5.18-1ubuntu1.4
libgnutls30:i386
I and another people have the same problem in Windows.
http://support.mozilla.com/tiki-view_forum_thread.php?locale=en-
USforumId=1comments_threshold=0comments_parentId=565636comments_offset=0comments_per_page=20thread_style=commentStyle_plain
Adobe-flashplugin may be the problem.
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