Illegal General Instruction Exeption

I get this error at random times.. not often but it's annoying none the less. It's been happening after I tried JJ OS 4.99, as I didn't have the funds to pay for the password I installed the free version & then went back to the Akai 2.13 OS.

So yeah, this error crops up and I can't lie and say its not a **** =P can anyone help?

Thanks in advance