I used XOOPS 2,0,7 and my themes worked just fine. Later i upgraded XOOPS to 2.0.7.3 and now to 2.0.9.b

i also upgreaded my forum to newbb2..

now i want to change my theme but i can't.. in administration mode in configuration i check other themes.. even check that new html would be overwritten and so on.. but.. nothings going on.. what it could be?

Did you try setting "Update module template .html files from themes/your theme/templates directory?" to Yes?

This is under sys admin> preferences > general settings.

Also, you may use the Themes block to see if the temes will change that way. You can enable the theme block under the sys admin>blocks menu. Then make sure you have all the themes you want to test highlighted in sys admin> preferences > general settings>Selectable themes.

You probably tried all this but that is as far as I can assist you. If that doesn't work then maybe one of the smart Xoopsers will give you a helpful solution.

Good luck.

delete all files in template_c folder maybe solve the problem