I know the white screen errors have been spreading around and I've been having the same issue lately. I have the updated version of tekkit installed to 0.5.4.9 and the log in works good. It's only when I enter/create a world when it says "Saving Chunks" for a few seconds and then flashes to a white screen. Can I have some pointers or am I leaving something out?
RE: OS: Windows 7 64 bit
Java: 1.6.0_31
Launcher Version: 0.5.4.9
No error reports