[Discuss-gnuradio] RTL SDR and GRC3.7.8 problem: format error

Ever since I updated to GRC3.7.8 none of my RTL SDR demos will run in GRC.  The error messages are the same: “ list contains an invalid format”.  Attached is the .grc file of a basic RTL Qt test flow graph authored using GRC3.7.8, and the .odt file with the complete error message.  GRC detects the RTL device, and cites format errors.   Are others having this problem with GRC3.7.8?  I am anxious to resolve this problem because I have scheduled a GRC presentation in the near future.

 

Regards,

John Petrich