Dave,
Actually the problem I described was fixed in the 1.01 release.
It's sad that you still have a problem, however we'll need a more precise description. For example I have just built a hello MicroC/OS-II with no mutexes, mailboxes, queues or memory management code and got no errors at all.
It's just a guess, but you may be being hit by the fact that the sempahores are required by the HAL, and code for Event Flags is required by the UART/JTAG_UART driver.
If that's not the explanation then please supply more information