Problem with spark 2.5.7 in Linux

Hi,

I would like to test spark in my system but I have the following problem. The spark starts up, I enter my credentials and I’m trying to login. It seems that it is able to login because the msn and icq messenger that are running they say that I’m logged in from another location. The problem is that after the login, I see only an empty frame, no buttons, no menu, just an empty white window.

My system is: Gentoo 1.12, x86, Xorg 7.2.

thank you