"Interprocess communication failure" error occurred when opening an image file

[JayDee]

Just ran into this error. "interprocess communication failure"

I have been doing some experimenting that has required bare metal restores
Using the same boot usb and stored backup stores were successful at least twice

Now I get the above error. 

I've tried the recommended restart process
I've tried alternative boot usb stick from another computer
HBS boots properly and it's only when I select the backup source
file that I get the error.

Any suggestions?

JD