Thanks for responding. I have rebooted and plugged in the Crumble and waited several minutes, although nothing happened, since the driver was loaded on a previous occasion.
I still get “ERROR: Crumble not found!” when I try to download a program to it.
Can you tell me more about how the device should appear in Device Manager and what driver DLLs should be attached to it?
Also can I interrogate it with any other software, say Python or C to diagnose the problem?