PT8.0.3 public beta Windows7 midi sync(timing) problem

[Blossi]

Hello all
my apologies if this as been posted somewhere else,
but I've discovered a problem after installing PT8.0.3 on Win7-32 Enterprise on a Lenovo T61 T7300 @2.00 GHz w 2.0 GB RAM.

I ran the PT8 installer (as Admin in VistaSP2 mode), then installed PT8.0.3,
then the 8.0.4 drivers, after which I plugged in my MBox2 and everything seemed to be working.

Then when I set up a Click Track and hit play it doesn't keep time very well, in fact not at all.

I did test running Reason 4 in ReWire mode and had to put the buffer size to 4096, don't know if that was causing it and I also tried with EZD, the click track and the notes played by the VI's (via MIDI sent from PT) were not in time.

Any suggestions ?

cheers
Blossi