I have two content assist favourites configured in a number of workspaces: org.junit.Assert.* and org.easymock.EasyMock.. Unfortunately content assist does not consistently provide me with completion options for these two favourites, e.g. at the moment typing assert cmd-space offers me no proposals. I would expect to see that various assert methods on org.junit.Assert.
I don't always have this problem, e.g. it seems to work fine in some workspaces but not in others. Once the problem's occurred, restarting STS doesn't appear to make any difference. I've looked in the error log and it doesn't appear to contain anything that relates to this problem.