Cycles viewport render different than f12 render? What could cause this?
f12:



Viewport:



(the f12 has fewer samples, but even when the viewport is at lower samples it looks different..)

I know about color management, but that is at the defaults..



EDIT: oops.. I know 'log' is not a default, but that is because I was fiddling with it. The image above is rendered with 'default'  

The material is quite simple, only a translucent shader. (for testing) I even tried appending everything into a new file to reset all the settings, but no difference.

EDIT2: Uploaded blend 
http://www.pasteall.org/blend/22200
The flower mesh has a solidify modifier which is only enabled for rendering. The extra thickness from this modifier makes the translucent material give a different result.

In general for differences between render and viewport, check these:


Object viewport and render visibility in the outliner
Modifier viewport and render visibility
Particles and hair resolution settings
Curve, surface and metaball tessellation settings
Render layer settings
Color management settings
Compositing nodes and sequencer strips