Server-Clients, Threads, Reflection, Processes and Everything Else

Hi All

I've got a real puzzler that I just can't seem to get my head around. Basically I'm writing a server-client using a third party dll to access their database. The third party library requires a login using a static method before any of the other methods can be used:

tpdll.Login(Username, Password); *

* The username and password will always be the same in my app

When a client connects to my server app it fires a new thread and calls this login. If there is only 1 client connecting at a time its fine. If one client connects and then a second client connects while the first is still logged into the third party dll the first client is disconnected from using the dll.

I've tried 2 completely seperate applications that log into the third party dll using the same logins and run them parallel and they worked fine so I know the third party app allows the same user to be logged in twice. So is this a problem with the threads using the same login at the same time? If so is there anyway to load the dlls seperately for each thread?

I'm using c# .net 2.0