Echoing some thoughts above
The druid tutorial was really well written and got me working with and comprehending the system far quicker than I had expected. 
That being said, I was able to get most the way through the tutorial before my crow started locking up on every “r sketch.lua” or “u sketch.lua” command that wasn’t immediately preceded by a reboot.
Explained differently, if I turn the unit on, I can get commands to work, and I can upload 1 script before a successive command to run the script (and refresh the changes made in the lua file) causes the unit to lock. Same with using the upload command. After which the only solution seems to be restarting my system. At which point I’m faced with the same issue of running 1 script. “^^r” doesn’t seem to do anything in these instances.
Last night, after running into this issue, I tried to troubleshoot and found the updated Crow firmware. The problem persisted after updating. Today, I tried installing the updated Druid, and the issue is has continued.
So far this tool seems incredibly useful and fun, so hoping this isn’t a huge effort to fix. Let me know if there’s any troubleshooting or diagnostics I can provide. I’m not getting any errors when this happens, the system just hangs. Here’s starting from a clean script. Uploading my minorly altered sample and hold sketch. Checking that it’s all loaded. And the the system locking on an “r” afterwards it is unresponsive.