First of all, thanks very much for the attention.
I will try to answer to all of you:

- Yes, all users that had the same problem used events (using IBO,
IBExpress, IB 6.0.1, FB RC2). One of them posted a message in my
first message talking about this. The others i saw in the MERS
database.

- I am not trying to connect to all servers at the same time. I'm
trying to connect to just one server at a time. But just one of them
crashes.

- My code is the simplest code i could make. I'm just using the
OnEventAlert event to make a IBOQuery1.Refresh;

- The specific server is a Linux box with a real IP. This Linux box
makes NAT whith the other machines in the internal network (All seven
server makes the same)

- About gds32.dll - I'm connecting using always the same machine (my
machine), so I'm using always the same gds32.dll, and just that
server crashes. If i try from other machines, the same occurs. If
some other client is connected whith an older version of gds32.dll
and i connect with a new version it can bring problems?