Wide tracks are important to reduce switching noise. We recommend 4 layer boards for most new designs. Be sure your design has plenty of noise margin, as the emulator will only make the problem worse. Consider noise at each step of the design. The single biggest hardware problem we see is noisy or inadequate clock circuits.
Microprocessors are very sensitive to the clock's voltage level, duty cycle, and noise.
Clock inputs on microprocessors are rarely TTL levels. Most other inputs are considered a ONE when the input exceeds 2.4 volts. Not so the clock. Typically the clock's minimum voltage for a ONE is about 4.5 volts. Sometimes we get a call from a customer with, from our standpoint, the best sort of problem.