[Theme: Grain] Newly installed blog and Error 346 occurs

Just acquired my hosting (iPage) and did the following:
1. Installed WordPress 3.3.1
2. Installed Grain theme 0.3 r2
3. Accessed my site and had the following error (Issue occurs with or without the YAPB plugin installed):

In Chrome (16.0.912.75 m) it loads fine but when the “details & comments” link is clicked, the following error shows:
Duplicate headers received from server
The response from the server contained duplicate headers. This problem is generally the result of a misconfigured website or proxy. Only the website or proxy administrator can fix this issue
Error 346 (net::ERR_RESPONSE_HEADERS_MULTIPLE_CONTENT_LENGTH): Multiple distinct Content-Length headers received. This is disallowed to protect against HTTP response splitting attacks.

In Firefox (9.0.1), this is the error:
Corrupted Content Error
The page you are trying to view cannot be shown because an error in the data transmission was detected.

The website loads fine on IE8 (8.0.6001.18702CO) but has the following errors displayed on the lower left icon of the browser – when double clicked, the following is the message:
Errors on this webpage might cause it to work incorrectly.
– Object doesn’t support this property or method (Line:70) pads.ph/
– Object doesn’t support this property or method (Line:101) mootools.js
– Object doesn’t support this property or method (Line:76 char: 4) pads.ph/ Code: 0 URI: https://pads.ph

any suggestions would be very much appreciated. No customization or blog post has been added yet. These are all after installation.