You cannot run more than one AdHoc report at a time (either on different systems or tabs using TWC). If an AdHoc is taking a very long time to run, and your not sure if its every going to finish or just crash out, and attempt to open another window and try to run another one while waiting, the system crashes. Then you log of and on again and try to run the report and it shows its still running in the background. The way it is programmed you have to wait for the AdHoc to finish running before starting another. This is a bummer as it requires us have to have a 2nd login (different ubl) to run reports.
We should have some kind of alert if the report is never going to finish, sometimes you just leave it running and come back in the morning and its still running. We should have a status bar, letting us know its still doing something and gives an idea on what the status is. It would be nice if we had a cancel button to try again or stop the report so we can run another if its broken or taking to long.