Gahhhrrrlic:
I'm not the author of that thread but interesting nonetheless.
?
I'm well aware that you are not the author of that article, who, incidentally, is a prolific poster in the Display forum here. I mentioned it because it appears to describe your problem and am pleased to hear that you find it interesting.
You are trying to write to digital pin 4 (PB4 / OC1B ) on the ATtiny85 directly from timer 1. That is exactly the problem described in the quoted article. Is digital pin 1 (PB1 / OC1A) free. You could try using that instead.