I created a fresh 1.3.8a installation on an upgraded 1.3.7 database.
The two sites I am setting up are #1 www.liberty-flag.com and #2 www.americasflag.com and so google doesn't catch on the test stores are in a folder called /xstore/
I created a practise template using the iC-AcadameV1.2F template from ichooze.com and set it up with TPP, IH2 and Hooverbox3 and it worked like a charm all the way through checkout.
I added the multisite add and modified files and setup my configure.php and the appropriate _config.php files. The first site is using the Academe template and the second is using the stock, unmodified classic with IH2.
Both sites load the home page index.php as advertised. sideboxes are appropriate, categories and product listings are correct.
The first site #1 will display every page on the site until you checkout and get to /xstore/index.php?main_page=checkout_shipping&zenid=647xxxxx I get a blank page.
The second site #2 will display every page on the site until you try and view a product's info or reviews or try and checkout.
Product reviews is blank
/xstore/index.php?main_page=product_reviews_info&products_id=1&reviews_id=1
Product info is blank
/xstore/index.php?main_page=product_info&cPath=2&products_id=3889
it will add a product to the shopping cart ( I have this site temporarly set up with no ssl) when you checkout and get to
/xstore/index.php?main_page=checkout_shipping
all I get is a blank page.
Might be a similar problems as "adnanrana" mentioned above, but I am at a loss. Site #1 worked fine untill I added Multisite.
JOhn ><>