Windows Vista - Application hangs upon exit if print dialog is open

PrintUI uses classes which communicate across threads using events. For a typical register\unregister communication, one raises an event to another thread and waits for a handshake. This wait is indefinite and results in a hang if the other trhread was somehow terminated. Application termination results in the killing of all threads other than the executing thread. The executing thread performs COM uninitialization, which triggers a PrintUI object to communicate with its corresponding thread. However, all threads having terminated, the executing thread waits indefinitely resulting in a hang.