That's odd. That can happen from time to time, if one of our console servers is running slowly and your console happens to be assigned to it (each time you start a new console it gets randomly assigned to one of the console servers linked to your account). But it won't affect the tarpit -- CPU usage only gets assigned if your code is actually using CPU.
Is it possible that your code did some large amount of number crunching before it printed anything out? Normally you'd expect the "Loading interpreter" message to disappear as soon as the interpreter starts, but there is a possibility that under some circumstances it might wait until your program prints something out.