but the administrator at the back end can upload any photos (with a maximum file size of 3MB)...
I've already check the site configuration of joomla! the upload size config which is 10MB, and the php config upload_size which is also 10MB.
Legal Image Extensions showed this: "bmp,csv,doc,epg,gif,ico,jpg,odg,odp,ods,odt,pdf,png,ppt,mov,swf,txt,xcf,xls,BMP,CSV,DOC,EPG,GIF,ICO,JPG,ODG,ODP,O
I checked the permissions for directories - they are all set at 755.
I checked the path to media folder - its "images"
I checked the path to the image folder - its "images/stories".
the category folder follows the rule (without spaces etc.)
I tried to uninstall phoca gallery and install it again but the problem occurs again.
I don't really know what to do? Please help... I can upload in the back end of phoca gallery as an administrator but in the user control panel it will show "NOT A VALID IMAGE" after uploading