I've just done a fresh install on a new computer with no change in writing directory, I experience the same bug.
Every time I launch ZK I get the error "Startup directory is not writable, ZeroK will be moved to mygames/spring" (But never does)
Followed by a few minutes of nothing,
Then "Move failed, please copy Zero-K to writable folder"
Then ZKLobby launches anyways
Problem with installer on windows 7? I've tried selecting said folder and setting all files/folder to be writable but same issue.
How to fix?