hi Simon,
the only other recommendation from Philip (in his video) is to ensure that you've restarted the hana servers.
in the live 2 course when we saw this issue it was either (a) the servers not running or (b) the servers needing a restart.
very rarely there was an issue in the live 2 course on premise related to studio / eclipse. we fixed an issue via a deletion of the user work folder (after backing it up) on the laptop / dev machine. this may not be the only other solution to the issue but we used it as we were stuck and in a classroom setting. hopefully you don't have to do this though...i.e. hopefully the server restart will solve the issue.
-jamie