[Typo3] empty basket with tt_products extension

[Mirco Jeske]

hi,

I installed the shop extension and stored a couple of products. The 
problem is, that putting a product in the basket results in an empty 
basket. I checked the code and found out that it has something to do 
with the session in fe_user. There is no rects array registered.
On the same system I set up a brand new typo3 installation in order to 
do some testing. Surprisingly the extension worked perfectely with that 
installation. Now I know that it has something to do with my typo3 
installtion (3.7.0) but I have no idea what kind of error appears to 
happen here...

maybe you have an idea? Any help is welcome, I would like to understand 
that mistakt, Mirco