[Evolution] Empty Inbox With Evolution 3.12.2 on Debian Jessie

[Roth <xy roth biz>]

Hello,

since one week, after upgrading evolution to 3.12.2 (actual version of
Debian Jessie), my Inbox is empty. Evolution shows the number of unread
messages (bold number near 'Inbox') but the pane with the list of
messages is empty.

Messages that are sorted into folders below 'Inbox' are updated also but
show also the new messages.

I tried to unsubscribe and subscribe the folders, etc. but nothing
helped so far.

Does anyone have an idea what the problem could be?

Many thanks

Christian