jakiman
For those that have issues getting stuck at 50% or thereabouts (for well over 15 mins), then please exit out of your wallet, try deleting these files, then restart the wallet.
This does not resync the blockchain nor touch your coins.
Default Config / Data Folder Location
Windows:
Go to Start > Run
%APPDATA%\PIVX
OSX:
~/Library/Application Support/PIVX
/Users/"username"/Library/Application Support/PIVX
Linux:
~/.pivx/