Just go through the following three steps.
Having the game patched already!
1. Go to your AVA Folder
2. Search the NWZ Launcher
3. Double Click to launch.
By using the NWZLauncher you will basically skip reactor and launch from this instantly.
Maybe you've noticed that if you launch it the normal way Reactor appears and it launches through it first.
Reactor pretty much just redirects it further to the NWZ Launcher.
If something is wrong with Reactor itself it doesn't redirect and hence doesn't load it / doesn't load the game.
This needs more testing though i'll let it in the thread.
(Don't have the NWZ launcher as you didn't patch your game yet?
IT WORKS. I LUV U.
Download the file, http://speedy.sh/M2z3K/NWZ-Launcher-Package.zip
Extract the zip file to NWZLauncher Package (If you have Winrar)
and go to C:/Program Files/Steam/Steamapps/AVA
Drag the 4 files to your AVA folder, and launch the NWZLauncher.
Where is the NWZ Launcher / (Where do i add the files in)?
Made a screenshot to make it somewhat easier.
How does it look like if you launch?
Like this. You won't get the other Reactor launcher anymore.
wiNx #1 Pro tip:
Create a Desktop redirect icon from that launcher for a fast start!
(You can delete the other AVA launcher icon if you wish. Or just keep it for safety reasons.)
EDIT: Removed the idle part.. it's another issue. Thx for the sticky.