Is strange behavior happening in the Silverstripe backend?

Question

Suddenly, whenever I try to click on a page in backstrin silverstripe, it initially looks like this: I started SS 3.2, when it started, I upgraded to 3.2.1 to make sure this fixes the problem, but nope:

Sometimes it displays this error message: [User Warning] Couldn't set response type to 404 because of output on line 1 of /Users/computername/Sites/themename/mysite/code/Pages/HomePage.php

If I update, this happens correctly, but if I go to add something gridfieldafter I click "create", it just goes to a blank screen, but it still adds to Dataobject.

Any idea what is going on?

Answer 1

Sorted. I had a space or two before the tag <?phpon HomePage.php- now it works fine :)