Switching Domain names

I have two hosts. One I was using for my forum and the other I was using for my webpage.

The host I had the forum on wasn't playing nice with PHP, which my forum is. I was getting constant internal server errors.

I decided I was going to just switch the DNS from one to the other. So my forum host would now be running my web site and visa versa.

It's been 24 hours and one hasn't changed and the other isn't showing up. And it's been like that from 4 hours after the switch.

Do you think switching the two the way I did would cause some kind of conflict where it can't switch one because another site is showing the same DNS and the other way around?

 

It does not matter that it is the same DNS if the address was changed it needs general Interenet propagation, and might take up to 72 hours.