fastgeek, there is a thread over in their forums where multiple users have posted having issues getting work units. I don't believe it is exclusive to an OS. http://universeathome.pl/universe/forum_thread.php?id=57#531 The admin is aware and working on it, but all I can say is be patient and make sure to have a backup project until you can get work/enough work.
As noted in that thread, the WU distribution is spotty at best. A couple systems have a LOT of WUs and one or two others barely have enough to keep busy. Am splitting between FAH & U@H for now.
I'm doing enough right now for #7 in RAC; but 1.1M is just nuts! Think the highest RAC I've ever reached in a project was a bit under 700K with SkyNet.
Eight day run to 1M resulted in at RAC of 79,174.38, which is good enough for 5th place. Plan on letting it run until I cross 25K hours on WUProp and then move on to something else.