Hi,
When I upload files (images) over a certain size the media upload page stops before 'crunching' starts and displays the dreaded 'HTTP error' message. See screenshot here: http://i.imgur.com/EjgyxV3.png
Basically, if I disable all plugins this error goes away. If I then enable only gravity forms, then the error is re-introduced. I have tested with my own theme, but also with the default twenty eleven theme just to be sure.
I've spent quite some time nailing down gravity forms to be the cause of my issue. It's similar to the one reported here http://www.gravityhelp.com/forums/topic/gravity-forms-causing-error-with-media-uploader but I think my case is slightly different.
The web-host for this particular site it seems is not using Apache, but instead Zeus Webserver which I think is probably an ingredient in the mix here. I'm at a total loss as to how to proceed though. Any suggestions?