OEM allows only one connection

I have a situation where enterprise manager (OEM) opened via 'Launch
stand-alone' does not open up connections to more than one database at a
time.  Specifically, if I have TOAD or sqlplus running already, and then
click on the little + symbol next to the db to open it in OEM, it
changes to a "connection established" icon, but all the folders
underneath it do not open up.  If I close all the other non-OEM
connections on my machine, OEM will allow the db to open properly, but I
cannot then open a 2nd db in OEM at the same time.  I can then leave OEM
running and make any number of database connections in TOAD or sqlplus
without any issues.  This problem occurs on 2 PC's (one XP and one
windows 2000).  I can only ever have one db open in OEM.

Years ago I remember running into a problem where the PC was configured
to only allow one db connection through the port or something like that,
but I don't think that's what I'm running into here.

Anyone run into this same problem?  Any solution?

Thanks,
Ben

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