IRC5 program error – start failed.

Hi.

I was just using my IRC5 to modify and recover some of my backup files.  I was asked to recalibrate/upgrade the revolution counters because the working station settings changed during setup so I had to go to a previous backup.
Everything was working fine till earlier on today when I saw that I was unable to run any program. My first thought was that I reverted back to a corrupted backup file but that was disproved when I ran a healthy backup from two years ago which prompted the same error.
I can't seem to find any sort of message that will give me a clue as to what is causing this (annoying!). I have included a picture and hopefully you can shed some light on this.
I'll be very grateful.

Start failed.

Unspecified error received from the robot controller.

See if there is more information in the event log.

OK