Design mode and "Can't create SWT browser"

I keep getting the "Can't create SWT browser" screen. This was
happening with 2.3 so I waited and updated to the 2.4 release but I
still can't get a designer screen.

I thought design mode was supposed to use webkit if it could. I've
also tried adding the command line option to enable webkit but it had
no effect.

Disclaimer: I'm running Fedora rawhide and a chrome dev.

Any debugging suggestions?

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