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Guys, I have found a solution!
I came up with the idea to "update" the whole Gallery2 version. So, looking for a newer version of Gallery2 i found the official Gallery website, with the downloads as well. There, i found the latest Gallery2 version 2.3.2.
Now, the steps i took are:
1). Download the latest XoopsGallery2 module:
https://xoops.org/modules/repository/singlefile.php?cid=36&lid=18742.) Download the latest Gallery2 version (2.3.2) from the official Gallery website:
http://codex.galleryproject.org/Gallery2ownload#Packages
NOTE: I picked the "Full" - "English Only" Zip-file version.
3.) Unpack both downloaded files in a separate directory and browse to:
"Unpacked XoopsGallery2 Directory"\ xg2.1 \ engine.
4.) In this directory: delete everything EXCEPT the config.php file.
5.) Now copy-paste the content of the "Unpacked Gallery2.3.2 directory" \ gallery2 directory into the engine-directory of the XoopsGallery2 module.
6. Install Gallery/XoopsGallery-module by the installation-manual, which you can find in the xg2.1/docs directory (install.txt).
Installation ran so-far-so-good for me. I'm excited to proceed to the installation of the module itself in xoops, and will post the results.
If you want, i'll be happy to provide a zip-file (or such) with the above steps done?