I see a few reports appearing elsewhere.

This error message normally refers to programmes that are not shown. I expect this will happen frequently for the next few days, due to some tennis matches. I say normally, but the error can mean other changes were made to expected SI data as well.

It is quite easy to check if the BBC change the schedule as they usually update their listings available here:

http://www.bbc.co.uk/tv/

to show exactly what was broadcast – select full schedule for relevant channel, and then date.

For instance, check out last night BBC1 (and HD of course) to see that Eastenders etc was not broadcast.