I'm currently having the same problem,
Some basic info:
Windows 7 (64bit)
Starting the launcher using the "TechnicLauncher-v0.2.exe"
And I know it should not be possible but here it is:
The logs: http://pastebin.com/WH3LLimJ
It looks like it just cannot find the correct directory/file and will just default to the .minecraft directory.
The "Clear Cache" option here only shown the following error:
"Failed to clear the cache! Ensure Modpack files are open.
If all else fails, close the launcher, restart it, and try again"
I did restart and tried again, but got the same error.
Fixed: Found some files in my C:\Users\[user]\AppData\Roaming\.techniclauncher which had the read-only permission set, removing the read-only property fixed it for me.