Please see news post: https://pivx.org/update-on-zpiv-release-10172017-12pm-est/
Unfortunately, the current 3.0.0, 3.0.2 & 3.0.3 wallets were found to have some issues and are being rectified.
Please DO NOT make any PIV or zPIV coin transfers until we announce that it is all okay. Thank you.
10/24/2017 UPDATE: Stable Release Candidate 3.0.4 RC2 wallet is now available.