new Siteground problems with Upfront

I'm not sure if this is a similar issue with Siteground or if others are having a similar problem, but here's the scoop.

1)I recently installed Spirit and was having the problems reported in this thread

I then added the bit of code reported in this thread , and Upfront started working fine.

2)After installing the recent theme updates from the WPMU Dashboard, Upfront is giving me the same error "Hold on just a little bit more" as it was before I added the code to the htaccess file.

3)I am also getting the following error:

Fatal error: require() [function.require]: Failed opening required '/home/advertab/public_html/wp-admin/wp-blog-header.php' (include_path='.:/usr/local/php53/pear') in /home/advertab/public_html/wp-admin/index.php on line 17

4) I have since deleted the added code from htaccess file thinking that perhaps that bit of code was no longer necessary due to the theme update, but no luck.

Any suggestions?

Thanks much
-Matt