Rick:
Thank you very much for answering my PM so fast. The solution you proposed seems to have resolved the problem


"...You might try swapping the control panel settings under Primary -> Advanced where it asks you if you want to allow access from multiple URLs or force a url. Whatever you have selected currently, change that to the other option and see if it works...."

Thank you very much

Still do not understand why it would be different in Explorer and Firefox but I am glad it works with both now

Thanks