It might have to do with the timedelta being very high for the first frame due to loading and such. Go to the application properties, runtime properties, advanced, and set the minimum FPS to something like 30. That might fix it.
It seems to be working! Thank you so much Arima!!! BTW game is called Twisted World. I'll continue the beta-test for a few days and then will post it on the forum. Don't miss it if you like Metroid, Super Mario, Contra and Meat Boy!