Same Problem.
My Technic Launcher is stating "checking for minecraft updates" as it has been for the past 20 minutes AFTER the 5 minutes it took to install the zip files and everything. The Voltz launch screen has been a blank white box the entire time. There was a brief moment (within first minute of launch) that a box titled "hello" was present, but it disapeared once I clicked on it's blank white window.
Help?