Tool8,
Been back on to Garmin. They updated one of their units and the same thing happened. The software is issued from Garmin in Kansas, USA and they have been made aware if the issue but it may tale a few days for the fix. I kicked off with them today as they will not re-release the previous cycle so until the fix is corrected we are stuck with units that are useless.
I am off work all this week so I will keep on top of them and, now I know you have the same problem, I will post here as soon as I find out.
If you need to speak to someone at Garmin UK my contact is Andrew and the number is 0870-850-1242.
Regards
Kev