I know hawkeye doesn't update often, but with both of these plugins installed, the /hawk search command stops working, any solution/fix?
When removing vault, hawk search works again.

this is not a Vault issue. Vault is a passive plugin that allows other plugins to hook it, most likely you have some other plugin that uses Vault activate and prevent something being used in hawkeye, or HawKeye uses Vault (and has a bug) so it starts checking permissions. You'll want to report this to hawkeye or check your other plugins for conflicts.