I tried the launcher today and it wouldnt work for me. I run the latest version of java.
This probably is a launcher bug and i think it is caused by my drivers.
http://pastebin.com/rqV0hVEp
This happenes every time I try to open a modpack. When i try to launch tekkit classic it first shows a black screen and then a white screen. with other packs it just wouldnt launch at all.