Load not generating on Agents.

I'm using loadui 2.0.2 and have (finally) been able to connect to an agent. But the load I can generate using a ramp generator doesn't go beyond the initial figure. So if I want to ramp from 200 - 2000/sec over 5 mins, it starts at 200 fine, but then doesn't move. If I move to local mode, it ramps up fine.?

Also after a test has been stopped........when you start it again, nothing happens, no load is generated and you mostly have to relaunch the app before it works again.