I've currently got CMSMS 1.2.3 installed, with the eSShop 1.0.1 module installed, and its been working great but then yesterday I couldnt add anymore products

I tried adding a new product to one of the categories but it just didnt add to the database. Didnt show any errors or anything..
It did the same thing the other day, but then I transferred the "includes" folder over incase something was corrupt, and that seemed to fix it, but when it happened the second time, I transferred the "includes" folder again and no change... its really annoying cause the module is doing everything great as I need it to (and I've edited the template to make it blend in the design etc) and now its just not working

Anyone else had the same problem?