I tried to start the HoL-PRT-06 and HOL-INF-10. I left two browsers open and attempted with two computers but was unable to connect to any lab. I'm using Chrome 24.0.1312 and also tried Internet Explorer 10 with any success. The screen just stayed on starting the labs and did not progress any further. I would try a different Internet provider but do not have access to one at the moment.
-Nick