Redline HMI not showing files (Solved, bad character name in file)

Running Redline V1.6.3 Gen 2

No problems in past weeks. Booted it up today, looked like a normal boot, homed OK. Tried to load an .ngc file from web interface. Files upload to controller and appear on the controller web page on my PC, but they don’t appear in the files page on the HMI. Attempted load from USB stick via side port, HMI saw the stick but not the files. Boot attempt with USB stick on USB powered extender, resulted in lots of clicks and controller crash (non-responsive.) Multiple reboot attempts, some from full power off and wait 30 seconds, no joy. Deleted folder, re-uploaded, no joy.

Any ideas?

Problem solved. There was a character in the filename that evidently caused the issue. Renamed files, loaded OK.