Seems like "Virgin Mobile Minute Checker" author has not updated the app for a while. I contacted him with no success. Surprisingly, Virgin Mobile also does not offer any app to manage your account.
Ultimately, I have started working on my own version. It is in google's play store under name "Virgin Mobile Minutes" (it has "V" and "m" letters in logo). It is free for everyone to enjoy. It is missing a widget for now - I will add it soon.
Check out the 'Minutes Checker Free' app by Monty Kamath in the Market. It has a widget and popups after calls and works with multiple accounts to check your Virgin Mobile USA Beyond talk minutes. Just search for 'Minutes Checker Free' and pick the one by Monty Kamath.
There are now two working Minutes Checker apps in Play Store that just launched in the past week. This one is better, IMO, since it's smaller, has no ads and shows data usage in the widget: