I had read the FAQ already (I had checked my GL libraries, I don't use compiz), but I didn't know the GL preview was related to the "Simple user interface". So I started Hugin while keeping Ctr pressed, then a popup message asked me if I wanted to deactivate the simple interface. Actually I clicked on "No", and Hugin opened whit the OpenGL preview enabled. Kinda strange, but now it's okay. Thanks.
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