Hi,
Had exactly the same issue’s with Kernel Panics on 10.6.2. Like you tried to get support from Highpoint but to be honest I was better asking my cat as I got more support. The only recommendation I have for you is to check if your drives support NCQ and set the card accordingly. For me after 6 weeks of trying everythingI did find a solution failed….
I did solve my problem !!!!
I bought the ATTO R380 and since then have not looked back. I would suggest giving the card a little more cooling via the smcFan utility but since installation I have hammered the card for 18 hours a day and not had a single issue. The support at ATTO is also second to none, great company , great product.
Just bin your Highpoint 4322 its nothing but trouble with Snow Leopard.