Theme: Headway 2.0.4
Gravity Forms 1.4.5
I turned off everything but the two plugins above and then tried adding the latest version of NextGen Gallery
NextGEN Gallery 1.6.2
Activate the plugin and I get a blank screen. Delete NextGen gallery via ftp and everything works again.
So then I did it the other way around. I deactivated Gravity Forms and installed NextGen, which worked and then activated Gravity Forms. Same thing, blank screen.
I think I have a similar configuration working elsewhere so I'm not sure what the issue is. NextGen being really popular and working everywhere else I have put it, I'm not sure whats up here.