I also was having the same problem with the new com driver.  Take a look at
your /etc/ttys.  Mine had rtscts and local on the line for the modem, but when
I removed them and replaced them with just softcar things started to work
again.  I not sure if this is the 'right' way to fix it, but it worked for me.

--Brian

> Something in the last com driver fix disagrees with my modem (DSI
> Connection 96+).  Any process that tries to use it hangs; ps(1)
> reports that it is blocked in 'tty in' or 'tty out'.
> 
> I would appreciate it if someone would send me either the complete
> version 1.56 of com.c, or a diff between 1.56 and 1.58.
> 
> I'm dependent on PPP for 'Net access, so this problem is a showstopper
> for me.
> -- 
> Mike Long <mike.long@analog.com>           http://www.shore.net/~mikel
> VLSI Design Engineer         finger mikel@shore.net for PGP public key
> Analog Devices, CPD Division          CCBF225E7D3F7ECB2C8F7ABB15D9BE7B
> Norwood, MA 02062 USA                assert(*this!=opinionof(Analog));