[Mono-winforms-list] Wrong icons on OpenSuse, right on Ubuntu

[pablosantosluac at terra.es]

Hi there,

We're experiencing some graphical issues with Plastic on OpenSuse
(latest) while they work well on Ubuntu (latest).

Message boxes (and dialogs) without icon (we don't set them) show up
without icon on Ubuntu (as they do on Windows) but display a weird
default one on OpenSuse.

Any idea why?

Thanks,

pablo