[otrs] Sending reply often hangs...

Hi all, I am new to this list since today and I started to implement OTRS on an OpenBSD 3.4 system. It works nicely, I've got my own procmail filters working, but I've got a question. It's very often that when I try to send a reply after entering it, the software doesn't get back to a normal state again: my browser is timing out, but the mail nevertheless gets sent. I'm using OTRS version 1.1.3. Anyone an idea? Thank you and regards, Eduard.