Question Mark Sign ? in Product-Url Link will not be processed

[old_fritz]

Joomla: 2.5.27
VM: 2.6.10

Hi there,

got problems with this kind of following product-url´s:
http://ad.zanox.com/ppc/?21912207C1032622545&ULP=[[http://www.gustini.de/pate-di-tonno-calvi-thunfischcreme-a74075r50104105.html?afpartner=03]]

If this sort of link is included in the vm product-url field and  I click on a product in category view I got the 404 error:
"COM_VIRTUEMART_CAT_NOT_FOUND"

I thought first the lenghts of the link or the double-http creates the trouble, but after try and error analysis I can clearly say it´s the "?" in the link which generate the error.

So is there any easy solution to tell VM, just let "?" be OK for product-url´s?

THX!!!

[old_fritz]

OK, found the solution.
For those who stick with the same problem:

Just deactivate SEF in Joomla Config (Seo).
After it, delete cache and reactivate SEF again.
Done!