Just a guess ... gigastudio added a dll that was incompatible with sonar, but that sonar was polite enough not to replace; the gigastudio files would probably be newer than the sonar ones.
You get a lengthy list of installed stuff in the gigastudio diagnostics; might be worth browsing? This might be a question tascam support could answer -- if there were a way to contact them other than long distance on your nickel!
I discovered it's a hardware issue. The MB or chipset just doesn't like two cards.
I have card in the 5th PCI slot-no problems. But cards in slot 3 or 5 creates problems for the card in the 3rd slot. Sonar freezes up. There is also no virtual IRQ sharing this way. Ihave had this problem before when the network was running.
If I put a card in PCI slot 4 it shares with the video card. I have yet to try slot two which will most likely share with the video card again.
This must be a Gigabyte/VIA issue.
Next I may try putting my Tascam PCI card in slot 3 and see what happens. That card never has issues.
I'm relieved that it's a hardware issue. The simple fix is to use one card in the system. The choice will be tough-go with the AP2496 or the Mia.
So it's not really a Sonar, G3 problem. I installed V Sampler and it froze also.
I've got the Mia and the AP2496 working together. For some odd reason when I put any card in the 3rd PCI slot with another card in it causes programs to freeze.
The Mia doesn't seem to mind sharing an IRQ with the network card.
Now I'm going to rease the whole system and start over.