Project wont start any more LPC1768

After making some changes to my code last night, my project builds fine, but no way will it start (under the emulator).

It is stuck in SystemInit() at the following instruction:

  while (!(LPC_SC->PLL0STAT & (1<<26)));/* Wait for PLOCK0                    */

I don't think I changed the clock configuration but clearly it's not happy

Here's what it is currently set to:

If that's invalid what do I need to change to make this work please.

Thanks, David