Using the extended interface, I have five PTLite windows open. Four have the minimize button. Clicking that button in any of the four windows causes all five to minimize to the task bar.
This behavior, reported for PTLite, now exists in PT2009 v.1.9.0.575.
It makes it very inconvenient for users who work with several PT windows open at the same time.
The prior behavior which minimized only chosen individual windows to the bottom of the screen was better. Having each window minimize to a unique task bar entry would be acceptable. What it does now in PT2009 (575) is not.
It's not a big issue with PTLite since, at most, only six different Macecraft windows for the main and subsidiary tasks can be open at the same time.