We are attempting to run a bare metal (no O/S) Kinetis KW40Z CPU under KDS 3.2.0 with KSDK v1.3 & Processor Expert and are having trouble with all interrupts. No interrupts are ever happening (timer, I2C, or serial). We are using the command INT_SYS_EnableIRQGlobal() to enable interrupts after PE_low_level_init(). The timers are not happening, the I2C routine hangs (awaiting OS semaphore), and the RS232 serial port never transmits. As a test, we have bypassed the driver software that was awaiting the I2C semaphore and bits now move out the I2C port, but the timers and serial are still not happening. Even when we build a simple test project, the timer interrupt does not occur.