Thanks for the reply, that's something from nothing.
Let me give some more information.
I had version 1.3.8.a, with no modules, and i was using greek language beside english, so i have made some translations there.
The site had no problem at all.
Finally i decided to upgrade to 1.3.9
I followed the rules, i used winmerge, and tried to alter, correct any differences between the two versions
Originally everything seemed to work well-to be honest i haven't noticed in the beginning if there was any image problem.
The only thing i changed later on, was to modify the admin login address-from admin to something else
The site is demo from the real site, so for now there isn't any problem
But if i want to upgrade i have to fix this point.
What i see is this:
Everything in admin, looks ok, i can see the new version, my customers, but when i go to products, and i open them, i see that i have uploaded a photo-the photo i see in the front- but i can't see it in the back. To be fair, i see it like a broken image.
The same for manufacturers. Everything in the frontend, looks ok.
I created a new product for test purposes, i uploaded a photo, but again i couldn't see the image in backend. There wasn't any upload problem just for clarification.
I can see normally the images in admin/ file.