AE CS6 Renders too dark

After upgrading to CS6, the Quicktime Animation codec suddenly renders way too dark in After Effects.

Quicktime in Animation codec is my preferred render codec, as it is as good as lossless plus adding alpha is an option.

Is there a cure for this problem?

EDIT: Seems things can go wrong while saving custom presets. Sometimes they just don't work correctly after saving.The third made preset worked, even though everything was the same.