I believe I understand what's happening now and it does look like it's down to focus; the Citrix window will not both to paint unless it believes it has focus (I think). It can sometimes come up without correctly getting focus (what most people seem to witness) or it can lose focus if you get an IM or SMS and the little yellow alert wings by. The work-around I have for this is to use the camera shutter trick to get back to the Hildon window chooser and then to select the Citrix window and bring it back to the fore. At this point it seems happy again. All I need to do now is to figure out how one might send CTRL-ALT-DEL it to