I'm a little confused by this. Were able to successfully save the old report in the new account? You should be able to do this by logging into the Report Designer, and opening the report. Then go to File > Save As and Connect to the new account before you save the report. That should save it to the new account.
One thing to mention is that you'll run into errors if you try to load the report on a screen that doesn't use the tables and fields the report is based on. It sounds like you are trying to run the report before the screen is ready.