When I send a report to Broadcast Agent I see a message saying “Broadcast Agent is Offline, do you still want to schedule this report”
The most likely suggestion is that your BCA is recycling its processes. This takes a couple of minutes at most. The frequency with which this occurs is controlled by the Delay for auto shutdown parameter in the ‘Broadcast Agent Manager’ module of the BO Services Administrator application. If you have access to your BCA server you can verify if this is happening by looking for a process called BcsKick.exe which will be visible via task manager. Another way of verifying this is looking at the last entries in the .log file for the relevant BCA. This is stored in the \server\broadcast agent manager directory on the server. You will see some fairly obvious messages about the scheduler stopping and restarting. Ours takes 6 minutes consistently.
Another possibility is that for some reason, your BCA is not longer being monitored. If you look at the ‘Broadcast Agent Manager’ module via the BO Services Administrator, you may not see your BCA in the list or it may be turned off.
Generally you should answer yes to the question and then you may like to check out what BCA is doing, to see if you need to start monitoring BCA again or if it is just recycling.
Nick Daniels 
(BOB member since 2002-08-15)