Hi Hans
There is a little annoying bug with the dialog "do you want to save the changes you made" with abstractions.
If the abstraction isn't visible the dialog doesn't appear. When trying to close the patch or quiting pd, nothing happens.
This is with Pd-0.41.4-extended-rc2-macosx105-i386.dmg from http://autobuild.puredata.info/auto-build/latest/
In Pd-0.42-5 the window of the abstraction gets visible when quiting Pd or closing the patch. I tested with GOP abstractions, but I guess the same happens with no GOP as well.