Thanks for the responses. I didn't edit the step.rc, I've opened it to see if there was anything apparent but haven't changed anything there. I haven't added any modules or things like yzDock, the most I've done with a theme is changed wallpapers.

!about shows loaded modules
tasks.dll
jkey-0.37.dll
jdesk-0.73.dll
xlabel-3.4.5.dll
rabidvwm-1.2.1i.dll
xtaskbar-1.3.8.dll
xtray-1.0.dll
xpopup-1.1.9.dll
mzscript-0.9.13.dll
NetLoadModule2.dll

The icons show regardless of which of ~20 themes I choose now, would one of those modules cause this behavior for all themes?