To put them back as they were before do the following;
Open a console or hit ALT-F2 and enter "
Change the "Button Layout" field to be;
The menu buttons should now be back in the top right hand corner.
Bootnote: I have just realized that the new default themes are somewhat broken by putting the controls back into their correct order
Notice how the pretty rounded graphics are now messed up because we have the square minimise button in the "wrong" position?
Another yuck. What are they thinking?
As far as I can tell, the only way to "rectify" this is to use a theme such as the old "Human" or "Clearlooks" or just about any theme other than the new themes that are specially designed for Lucid.