What version of VP is being used? Upgrade to the latest. For licensed users upgrades are free for up to six months from purchase date. After that, VP will continue to fully function but a fee will be required in order to register the newest. Retain your old install file and registration info.
If that doesn't solve the problem, please post again. We will want to see your PORTABLE project, just as you do. Sharing is the best way to track down issues.