I tried to change the pack to a hd resourcpack created with the tool. In 13w24a it worked, but in 13w24b I wasn't able to select the pack, wenn I closed the recourcepackwindow minecraft crashed.
Environment
OS: Windows 7 (ver 6.1, arch amd64)
Java: 1.7.0_21 (by Oracle Corporation)
Launcher: 0.9.3 (Dev) (bootstrap 3)
Minecraft: 13w24b (updated Fri Jun 14 15:54:59 CEST 2013)
Incomplete without crash report. Please attach crash reports in the future to tickets about a crash.