Vista - invisible "Posteingang" (inbox folder) on IMAP account

When I call up the folder list of my IMAP account I can see my "Posteingang"
(inbox) folder and can click on "Go To" to see the content (incomming mails).
But it's inpossible to make it show up permanently! The buttons (show/hide)
are grayed out and can't be selected.
So everytime i startup WinMail the "Posteingang" is hidden and i've to call
up folder list, select "Posteingang" and click "Go To" to access my incoming
mails.

I've seen many peoples reporting this issue but only on non-english vista
versions (german in my case).

So please, if anybody out there have a good hint for a workaround or a nice
Microsoft-dev could make a FIX for this, please help???

regards zuegs