I had Magento 1.1.8 as installation source, but right after I installed it on server, I saw a message that 1.2.0 came out.
Anyway - I didn’t wanted to do any more upgrades since I was about to launch site live.
What I did, is - I installed French language locale and blank interface and guess what - it came with all these additional packages like Core modules 1.2.1 and so on.
Since I added products before I “upgraded” I didn’t notice any changes as long as I didn’t need to add new product.
What happens now is I can not upload any pictures, I can not save products, I can not add products to categories.
Any help would be appreciated.
PS My /js/ folder seems to be ok, permissions were set correctly.