It would appear that Betfair have some problems with their Greyhound data today.
If you are running a version of TBE that is earlier than 2.6.6.2 then it is likely that not all meetings have been loaded.
If you are running version 2.6.6.2 or later then you should not be affected.
Details of version 2.6.6.2, including a download link, can be obtained from viewtopic.php?f=2&t=412&start=0
Apologies for any inconvenience.
Alistair