I upgraded this morning, ran the /dev/build/?flush=1 and now I cannot access the admin section of my site. The url http://my.domain.name/admin returns:
There has been an error
The website server has not been able to respond to your request.
which isn't exactly the most helpful of error messages. The rest of the site is working correctly. I have the blog module installed (v 0.2.0) and if I go to the /Security/Login page I can login. However, then trying /admin produces the same error as above.
There are no errors show up in the webserver logs. The other posts on this error don't seem to have answers or apply to my case.
Note - That Error is the generic error message, if you come across it put the site into [url=http://doc.silverstripe.com/doku.php?id=debugging]devmode[/url] and full errors will be displayed and reported.