I am stumped. I have tried 3 different Digisparks, on both an iMac (with two different USB hubs), and on a Windows 7 laptop. All 3 of the Digisparks are clearly loaded with the Blink sketch before I upload anything to them, since I plugged them all in first.
I installed all software and the driver (for Windows) as specified. I set up the Board and Programmer and am able to Upload the standard Blink sketch with no errors shown. However, after the upload completes, the LED never blinks! Just the power LED stays lit.
Thank you so much for your help with this!
Claudia