I don't get it...
I use several themes. The default theme is OK. I want another theme with a slightly different theme.html and a different logo.gif and style.css. I created two folders A and B.
I put a copy of the default theme is folder A an the edited theme in folder B. I checked it and it worked.
I am not satisfied with the name of folder B and want to change it in Folder A. So I deleted the files in folder A and copied the files from folder B in it.
I refreshed. The result was a theme looking and working the same as the default. So I deleted the complete folder A. I changed the name of folder B in A and checked it. Unfortunately whithout result.
You can see the settings in Admin here



You can see it (not) working at http://www.informatienet.nl
Default is infonet, Folder A is Kionda, Folder B is Ki-on-da

Can anyone give me the clue?

Most themes fetch the block themes from another file, which needs the directory name in the path.
If you do not edit the theme.html to fetch the blocks from the correct directory, it will not work.

But why does it work in folder B?
I just made a Folder C and copied the files from B (Ki-on-da) to Folder C. Now you can choose Folder C as a theme and theres is no problem. It seems the problem is caused because I put the default theme files in folder A first?

delete the files in xoopsroot/templates_c and try again.

Great! It does work.
Can you explain it?

My guess is that you still had them listed in the System Prefs when you physicaly moved the directories.