Hi Cron,
vorpX is devoloped constantly. If you bought it roughly a month ago, it might even be that you don’t have the current version installed. Normally updates are installed automatically, but if the auto update fails for you, you can always use your original installer to install the latest version. The next update is due in a few days, probably before Christmas, version 1.0 will be reached around the time the consumer Rift is available.
There seems to be an issue with Portal 2 that apparently affects about 10% of all machines. Unfortunately we cannot reproduce this issue here so far, but since Portal 2 is quite popular this is under constant investigation.
In case you haven’t done so before, please check the steps mentioned in the trouble shooting guide above, maybe it contains something useful for your problems. Refunds are not possible after a month of usage, I hope that’s understandable. Also please keep in mind that there are no guarantees regarding unsupported games.
Hope that helps.