I download, install, and patch Rappelz fine, but when the launcher starts up, and I click Start, my mouse cursor goes into the hour glass mode, but nothing happens. It returns to normal a few seconds later. No windows pop up or anything.

Any suggestions as to what might be wrong?

perhaps your pc cant run it? some games before i upgraded my pc i had that happen (not now of cause since my pc meets most games suggested req or passes them).

you might want to consider a new computer or just upgrading everything the game needs...
this computer was $700 and is by far better than computers that cost like $1500... kinda wierd

and i have lots of giga-byters :p