samba - Oct 2006 - After some time win98 clients hangs - samba 3.0.23c

Hi.

I have upgraded samba from 3.0.10 on centos to samba 3.0.23c.

In network working win98, winXP. We use dos applications, and sometime 
win98 immidetly hangs in this app. The machine must be restarted. I 
never see this behaviour with samba 3.0.10. This happen for different 
network installation - another localisation. After switch to 3.0.23c a 
must revert back to 3.0.10 wich came with centos, because dos 
applications hangs on win98 clients and some time on winXP. With 3.0.10 
i have stability and no problem at all.

So what can be the cause, samba 3.0.23c hangs my dos network application 
and 3.0.10 not. Oplocks ?

Any idea ?

Regards,

Irens