Hi Neil,
Understood. It's just your running the server with 1/4 of the minimum memory requirements we recommend -- it will likely not work in unpredictable ways, ways that will appear to be a failure of BigBlueButton to the user..
One of the reasons we have such minimums is we've seen people installing BigBlueButton on 1G or 2G servers, try it, then post to the bigbluebutton-setup mailing list saying "My server is not working correctly -- please help!!".
Of course, when they post, they usually don't mention that they are installing it on an under powered server. After some back and forth on the mailing list, we eventually realize this and (politely) suggested the follow the minimum server configuration.
Regards,... Fred