Nope, I ran the code exactly as was written above.

I commented out any update and rendering methods to let it run with out any outter methods.
When i did run with update and render methods, I ran some test with timers, and it updated every 10 seconds, as I could see on the gui.

Eli,

I copied and ran your altered code for Variable timestep.
There seems to be a problem with the thread sleeping. Instead of sleeping for 10ms, it sleeps for 10 seconds( 10000ms ).
Have you or anyone else tested and used variable timestep method?