The only thing that i remember from the past regarding this type of issue was using the browser at the same time as using the application.
If that has changed, then as @astroxb0o suggested it might be something that neopets has recently implimented.
The options i have at my disposal are:
a) Keep the programs up as they are
b) Take them down
I do not have time to do any digging or investigation into the problem. If someone knows the exact situation that has happened and how it would change the code, then perhaps i could take a look. But I really do not have time at the moment. Sorry.