2.7.1 Theme Issue

The error is in the themes, not WordPress. Not sure what it is, though.

Do you have any of these themes in a subfolder of a subfolder?

Normally, themes look like this:

/wp-content/themes/default/
/wp-content/themes/classic/
/wp-content/themes/whatever/
/wp-content/themes/other/

and so on. But if you have them like this:

/wp-content/themes/folder/other/
/wp-content/themes/folder/whatever/

Then the preview doesn’t show up properly. I discovered this recently when making some theme adjustments.

Same error here. I discovered this error occur when the folders name contains the character “-“. Then you just have to change the name.

The problem, in my case, would occur with several theme:

• mushblue-01
• elegant-grunge
• cosmos-plus

But it would work with every other theme. These three themes were made by three different people, and didn’t appear to have anything in their folder to cause them not to work. The only thing these three themes had in common was a hyphen in their name.

So I renamed the folders to take out the hyphen, suddenly they worked.

Give it a shot.

That worked! Thanks everyone!

I am having a possibly related issue. No matter what theme I choose in the viewer, I see my current theme. I have corrected those regexen in source, but it hasn’t fixed the issue.

This problem persists even when previewing the WP Default and Classic themes. I’m open to ideas about fixes.