Im getting more or less the same problem
works fine with a backdated version of 1.1: but its not liking 1.2
Logs: http://pastebin.com/fmq73G2E
Logs are complaining of a mismatch with the MD5 checksum: its failing to allow the minecraft.jar through.
- Tried total reinstall of TechnicPack including manually deleting all files - couldn't see much else. I have the latest 64-bit java installed and whatnot - can't see anything else that might be awry xD
- Not allowing me to clear the cache: says "Failed to clear the cache! Ensure Modpack files are open. If all else fails, close the launcher, restart it, and try again" - tried that several times to no avail.
Hope there's a fix soon xD
