That is really annoying, I can't reproduce it here currently but we will try.
I hope we can help, but everything is always longer when it comes to PT.
BTW if you can reproduce it in another DAW, or a more recent version of PT, 9 or later, please tell me.
As a matter of fact we don't officially support version older than 9 anymore. And the upcoming AAX and PT11 is not helping.
So far I tried on PT9 and 10, mac 10.6 and 10.7 and even recording, or just playing, one or several track I didn't encounter any problem.