This just happened to me last night as well. The printer became "offline" or "unable to connect" in the print queue interface during a print, then became unresponsive when the print was done. The wheel could be clicked, and would make a sound, but that screen wouldn't clear, even after restarting the printer.
This did occur after a firmware upgrade.
It looks like you're going to need to re-image the Olimex board. There are instructions online here:
I'd recommend reaching out to your reseller for help.
Did this happen after updating the firmware?
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