Redirected to backend login screen when trying to update product description

[csluk]

Hello, since very recently i got issue with updating or creating new products in my VirtueMart. When i edit anything in product description and try to save the changes i'm immediately redirected to backend login screen.
Whats wierd, each time i log in again, joomla shows that im already logged in and my name is showed multiple times on the logged user list.
Please help.
Joomla! 2.5.20
Virtuemart 2.6.0

[jenkinhill]

? http://forum.virtuemart.net/index.php?topic=99353.0

[csluk]

I think setting myself as a vendor in Orders & Shoppers/Shoppers solved my problem .
Thank you.

[csluk]

Sorry for didgging out this again, but the problem has returned, even if  i set myself as vendor im still getting kicked to backend login everytime i try to save any change to a product.
So far i tried 3 different and cleaned up browsers, different pc with different system, and i recreated my account in joomla, and nothing.
Please help.

[csluk]

Anyone please?
Its relly getting anoying, i updated to VM 2.6.6 but the issue still presists.
Everytime i try i make any change to a product it kicks me out from the site to backend login screen .