Ok.  I decided to start a new thread concerning this problem.  Here's the situation.
I'm trying to get set up for the upcoming SGO4 campaign.  This will be my first D2 campaign.  As far as I know, Slave Girls of Orion 4 is an OP mod.  Here's what I've done.
I've installed OP, fresh install.  Installed the 2552 patch.  Installed FireSoul's shiplist 4.0.  Installed the SGO4 mod.  In that order.  Only once was I able to log onto the test server.  Ever since then, I keep getting the error message that starfleetop.exe is missing.  I know it's not missing because I go straight into the game folder, locate the file, made a shortcut, used the shortcut, and even used the file directly, and still the same problem.  
What confuses me is this.  I can't log onto the SGO4 server, but yet I can log onto the other 3 D2 servers that I see on my list, and from what I can tell they aren't running SGO4, and I'm still able to log on, with the SGO4 mod installed on my game.  
Any ideas as to why this is happening?  I can play skirmish missions without problems.