To import a game you upload the .tar files to admincp/games then when you log into your admin cp go to v3arcade then game tools and then import ipproarcade game.
The problem seems to be the same oen MrZeropage posted which i have added below.
Please notice that new ibProArcade-Games (those one with integrated cheat-security) use a complete different way of score-transmission and won't work with v3arcade in current state.
There are games for that new type of score-transmission available here:
http://www.ibparcade.com/index.php?dlcategory=15
(you need to have an account there first)
Those games encrypt the score that is transferred so that there is no chance for somebody to fake it during transmission ect. as kind of cheat-protection
Hope this helpful.