When I get the close dialog, it often shows up without an "Yes" button, only the "No" button. The space where the "Yes" button should be is totally blank. But if I click where the "Yes" button should be, it works, and the button reappears as the dialog goes away.
I am currently using pd-0.37-0 and Tcl/Tk 8.4.1 on MacOS X 10.2.8. This has been happening with the 0.37-test version also, and with earlier MacOS X updates. I don't know if it happens with different version of Tcl, but I could test with 8.4.2 and 8.4.4 if that would be helpful.
.hc