Hi, I've been having the same problem. After updating to the newest SDK (1.9.2), the problem persists but the error message has changed:
19:07:27: Loading: Failed
update failed: "(null)" was built with an old version of the SDK.
The device firmware has introduced an incompatible change since this PDX file was compiled.
PDX version: 0
Firmware is compatible with 10000 and up.
Please update and try again. Thanks!
19:07:27: Update failed, simulator paused.
(The same PDX loads fine after moving it to the same drive as the SDK)