In Fedora 12, application with buttons having pop-up menus: mouse cursor becomes trapped within bounds of button. No remedy except to come in through a console or net link and kill the application. Problem occurs whether application is compiled with Lesstif or OpenMotif, 32 bit or 64 bit. Problem is probably with X server or library, not with Lesstif itself. When application run remotely (ssh -X), the version of X.org on the X server (display) is relevant. See Red hat bugzilla # 543647 <https://bugzilla.redhat.com/show_bug.cgi?id=543647> for further details and test applications.