Not necessarily. There are alot of people using 2.5.5. I'm not because it took so long to load my files. But, I've read (here) that after they are loaded once, it loads quicker the next time. I just haven't gotten around to trying it again.

But, as for what the error message means, we've (those who've posted it) have received no answer as to what it means. I think someone posted something about it having to do with Java. Read around this (Mac Installation) forum, you might find it. I know it isn't very old.

Don't give up just yet...