Originally posted in themes, with no resolution.
I have installed WordPress 3.0.1 with the default theme (TwentyTen), and site is working fine.
Uploaded a couple of themes, Mystique.2.4.2 and Atahualpa353.
They are listed in the Appearance—Theme subpanel, but:
Selecting preview of Mystique renders a blank white page.
Selecting preview of Atahaua renders a white page with the text line at top: “Powered by WordPress & the Atahualpa Theme by BytesForAll. Discuss on our WP Forum “
I went ahead and installed Atahualpa, and the Admin panel has options for setting up the theme, but still displays the same as the preview.
I can switch back to the default with no problems.
I have a couple of plug-ins, but deactivating them makes no difference.
I have not edited any php files, or made changes in the editor.
Any ideas what could be wrong would be appreciated.