3com router, DHCP

Hello,
I have a problem….
For this to make sense, take notice that this is a long link, thus multiple APs (the long link has nothing to do with the actual problem).
The setup:
Point A: 3com router, DHCP
Point B: D-link 2100 AP in client mode connected to another D-link 2100 AP in AP mode (cable)
Point C/D/E: Ordinary clients, laptops etc
The problem is that only one computer may connect to the internet, which computer who gets online is only a matter of who’s first to logon. With other words, everybody has been online at some point, but alone.
All computers have contact with the AP in point B at all time, but only one computer get an IP assign.
Personally I can’t remember to see any configuration option in the D-links which would remotely relate to this problem, thus the 3com router should be the sinner??
Is there any configuration related to this subject in the 3Com routers?
Thanks!

If your 2100AP has the later f/ware installed then it will only work with a single client in AP client mode. I think it was ver2.00 f/ware when you could last have more than one client.