BEFORE you can convert a parametric shape into a Bezier shape in the Windows environment, you FIRST have to
1. Right click on the shape to open the pop-up
2. Select "Group"
3. Right click on the shape again to re-open the pop-up
4. Select "Convert to Bezier"
On the Windows platform, AE will not convert a parametric shape to Bezier until AFTER you complete these steps.
Every other time I attempt to duplicate an instruction, AE doesn't work the way you describe. Are these instructions specific to the Mac platform? They certainly don't work in Windows.
You're announcing the winner on June 31st? SNEAKY.
(You DO know that June has only 30 days, right?)