The data sources are supposed to be blank on the trial (but I am going to have Yong change that). It's ok if they are.......... you are still receiving data.
Can you tell me what the error message says when u switch stocks?
If it's "QLGC's default setup is not found", that is ok too. It is not found because you never saved it. Just press ok, then press enter and Qlgc will come up.
If you can change parameters, then that is ok too. You are supposed to be able to change parameters.
I think the trial is working fine, but you just misunderstood how to use it.