thanks, maybe there was a problem with the Assets.
Please uninstall the new gallery completely and check whether all database tables and folders were removed after that.
If yes, please install it again and try once more.
I uninstalled and checked the assets...There is no reference to Joomgallery in the asset table
Did you do a check in maintenance manager of the old gallery afore migration? If no, please do that, too.
Yes I checked, it displays the following
"There were no corrupt images found! All images should be shown properly."