Thanks Rob, that does work, though I have lost about 30% of my plugins. Also I am unable to start Logic by simply clicking the Logic icon on my Toolbar or Apps. I can only start Logic using your method. I was hoping that now that it has ran Logic, it would have fixed it so that it opened as normal, but it seems not. A solution for this would be very much appreciated.
I have to confess though, I was foolish to install OS X Lion, having a very long history of Apple and Logic. For some strange reason, Apple have always had it in for Logic users and since when Logic was an Emagic product, Apple have always rendered slightly older versions of Logic useless, forcing users to constantly pay for the newest versions. It's pretty poor form on Apples part, when you consider that only anout 1% of musicians make any money out of it.
This fix will get me by, but sadly it seems that Apple have screwed me once again and I will be forced to pay for yet another Logic update that I don't need.
Be assured people, this fix may work now, but Apple will ensure that it doesn't in the subsiquent Lion updates. Be ready to pay up kids!