May as well add me to the list too!
I am working on it some tonite, so if I find anything that seems to work, I will be sure to post "my" fix
I got mine to work after about an hour of tinkering.
I just wrote the entire steps I took to try to fix it, and my post did not appear :( .
I really do not have time to do the long version again, but I will sum it up in a few steps as best I can here.
1). Save your DB before doing this.. just because it worked for me, does NOT mean it will for your situation. (do backup)
2). Re-install the directory: modules/system/admin/tplsets for 2.2 again.
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3). Open your DB with phpMyAdmin to the xoops_tplfile table.
4). Browse the table and remove any erronious entries that exist from old mods (deleted ones).
4b). Remove all SYSTEM entries from the same table. (I found it easier to just browse that table, and sort by the tpl_module name to group them together.)
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5). Clear out your templates_c directory in root folder.
6). Go to your module admin page and update the system mod.
7). Go see if your template admin area is back to some normalcy! You will probably have to generate templates again if you are using a custom set as I am. Most everything worked just fine after I did these steps.
Now time for bed!
Let me know if this worked for you as it did for me! Then I can finally say I made a decent contribution for a change to the community. I'm still a newb, but learning XOOPS more and more over time.
Good Luck! -- Jokes