Please fire yourselves and whomever you're outsourcing driver support to.
Just because you claim that Snow Leopard is supported by your drivers. It doesn't mean that they're actually working properly, don't lock up, allows 64-bit mode, etc.
Apparently these jackasses think if the driver actually manages to install itself without taking down the entire OS. Surely it must work properly. Surely.
::: will never again use TASCAM gear after his FW-1884 dies :::
tascam gear generally works great, but you have to A) be skeptical of their support claims and B) never need tech support ever