We regret to inform you that this product ......... ERROR

[MDT123]

We regret to inform you that this product (Gray T-Shirt w/ Color Logo) is either temporarily out of stock or not in stock in the desired quantity. Please submit your email address if you would like to be notified when new stock arrives for this product.

I cant find a reason - all items are in stock.. previous thread was not helpful.. anyone?

Virtuemart 2.0.18a
Joomla! 2.5.8 Stable

[pcAbout]

There are more of us with the problem...

https://forum.virtuemart.net/index.php?topic=112304.0

https://forum.virtuemart.net/index.php?topic=104730.msg353781#msg353781

[psalamon]

J2.5.11 VM2.0.20b 
I have the same problem. I do not see ant reply that contains a solution... has anyone found a solution?