[TYPO3] Funky page view

[Simon Browning]

Not sure what has happened, but on one site suddenly the page view in 
the back end is messed up.  It's showing the root page of the website 
but without the stylesheet - its almost like View view, but only showing 
the root page and without the stylesheet.

It was t3 3.81 with templavoila .4.  Hoping it was some weird glitch and 
upgrading t3 would the issue I upped the site to 4.1 (with latest tv), 
however no go, same issue.

This happened immediately following adding a second top top level page 
(immediately under the site root - id=0) for a second domain.  We've 
done this plenty of times in the past, no issue.

The sites been up for a couple of years.  FE is fine, just BE page view 
is messed up.

Any thoughts would be appreciated.

Thank you.

Simon