IAR IDE Error: "The C-SPY option "Run to 'main'" is enabled ..."

Hi, this error recently popped up for no good reason:

I can't figure out what causes this to pop up.

What I do know:

• This occurs on the IAR Workbench version 8.11.1 from February 2012 - the one that came with BLE Stack 1.2.1 (which I'm using)
• Happens regardless of hardware and debugging method: Both on SmartRF05EB and KeyFob with CC2540, using either USB debugging or the TI CC Debugger. All boards have the latest EB firmware available burned. Reflashing them did not help.
• Occurs regardless of optimization settings.
• Occurs whether or not I set breakpoints through the IDE ("F9")
• As expected, this has nothing to do with the code I'm building (reverting to previous versions did not do the trick)
• Pressing Execute causes the workbench to hang and eventually crash (as the message contents might suggest)
• Pressing Stop allows me to resume debugging, but the debugger driver won't allow me to set new breakpoints. However, memory monitoring and instruction stepping does work via the IDE.