Hi
Yes funny you say that, I got that message on my 26" WLT66 Toshiba regza - on Wednesday evening about 9pm.
Followed the instructions but nothing happened, after a number of minutes the TV just went back to normal viewing but the message popped up about 3 times - without it doing anything or updating the software.
I then went into the menu and found search for auto update, and after that successfully searched it showed there was no update available. I just turned off the option to auto update.
My software version is 2.10.
I can't find anything else out about it on the www.