Problems after updating from latest Beta7 to RC1 preview (also did the Database schema update)... first everything seems to be ok, but when trying to view product(s) node will produce the following error:

Object of class stdClass could not be converted to string in /home/XXXXX/sites/all/modules/ubercart/uc_product/uc_product.module on line 224.

This happens only full node views, not in teaser views. One more thing, the error does not come when logged in as admin (anon and normal logged in user will get the errors... here)

I tried to disable additional modules one by one and saved the products again, but no help.

Any ideas?