When I tried to access the free plugins page on my pro sites, I only see the premium plugins. I noticed that the premium themes page url is "http://radar.borgmatrix.biz/wp-admin/themes.php?page=premium-themes" while the premium plugins page url is the same one of the free plugins "http://radar.borgmatrix.biz/wp-admin/plugins.php"
I'm running Pro Sites for the first time now, and the PayPal process is ok.
This week I automatically uptaded my entire network to Wordpress 3.3. The Pro Sites version is the 126.96.36.199
Update: problem fixed. close this topic please.