Maybe you're having the same problem that I just did:
# warning: include_once(./) [function.include-once]: failed to open stream: Permission denied in ...\theme.inc on line 155.
# warning: include_once() [function.include]: Failed opening './' for inclusion (include_path='...') in ...\theme.inc on line 155.
If so, check your theme's .info file - you may have misspelled the theme engine. It needs to be as follows:
engine = phptemplate
Make sure it's all in lowercase.
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