i just tried to upgrade from 4.8.1 to the latest version and got major problems...luckily i did a complete backup of old version and database before i began
the problems started after the second step when the software told me that it was moving all the images or something like that and that i neede to be patient....and then i received a lot or error messages because it didnt find:
folders...there are many thousand images in our db and none of them are sorted after this in the old version...all sizes are saved in same folder
then i reloaded the page as it told me to do if i got error messages...i did and then it said that it was sucessful..ok...next step....then i started getting a lot of error messages from the program telling that it could not unlock files because they either did not exist or did not have permission to do it...i fixed this....went through the rest of the installation...but then...when i launched the page on the site...there was no images at all there..no thumbs...no medium or large image...hehe...not good..
anyone have any idea what went wrong? the data and upload folders was all 777 including the subfolders...so the reason why it was not able to "move images" was not a permission problem...