Why won't Konsole start from the icewm menu?

This used to work. My icewm menu has an item for running konsole. In .icewm/menu the line is: prog "xterm" xterm konsole Sometime, a month or so ago, without any changes to my .icewm/ files or /etc or anywhere, it stopped. Bringing up the menu and clicking 'xterm' (a misnomer, but whatever) nothing at all happens. Previously, a Konsole window with bash prompt would appear. I can still get konsole to run straight from any command line in another xterm, rxvt, konsole, or gnome-terminal. There are no error messages or anything suspicious. I'm running on Arch Linux, updated just a few months ago, well before this mysterious loss of function. Perhaps related, in Thunar, "open xterm here" doesn't do anything. It used to work, and as far as I recall, stopped working at the same time. I tried using pacman to remove and reinstall konsole, and thunar, but no change. Note that I'm not using the KDE desktop, but do use kwrite, konsole, ksnapshot and a few other KDE-based apps.