I was using DOSBox 0.63 before. I downloaded 0.72 and it runs WC3 flawlessly, so issue resolved!
Runs great using the default core and cycles settings (auto).
Oops! Forgot to login! That's my question above!
I'm using my original WC3 CDs that I've had since it was released. I've also got every WC and Privateer game on their original diskettes and/or CDs. ;)