i noticed that when my cellular and wifi were both ‘online’… are you attempting to connect at work or something through wifi? a lot of corporations are going to allow the device online but block some functionality. Where i work, we block pandora radio and app downloads etc, but allow iphones and andriods on the network??
try to only be on cellular only when you download…
also, i noticed a download hanging up once, i just hit cancel download then redownloaded and it worked immediately?
and yeah, task killer lite is a good app, ignore the “HTC Sense” task running when you use it