OnChangeEvent.fire does not really fire event. (MS CRM server)

I have very strange problem with MS CRM. Some client-side code are not working at client computers.
Finally I traced it down to DHTML behaviour problem.
In MS CRM we have IMG.lu.htc behaviour, which implements some kind of lookup

control. To fill it I can eighter use a popup dialog (window) with list

of values or use Form Assistant pane from the same page.
On CRM New Case page I have a number of such lookups for different entities.
Repro steps:
Open new case,
On

new case form choose Account from Form Assistant pane (important !)

Account field onChange is fired - but from this point no other lookup

fields will fire their OnChange events. (while Account continues to

fire it's own as intended)

If you use any other lookup except Account first, or use Lookup pop-up window to choose account - everything will work fine.
Finally I traced down to following code at IMG.lu.htc (function RaiseOnChangeEvent)

onChangeEvent.fire(oEvent);

On

Acccount lookup it works as intended - fires whatever is put into

onchange event. For all other fields - it doesn't do anything ! Don't

know why..

Any help is appreciated.

BR, Alexander G. Nonikov

[1263 byte] By [agnonikov] at [2008-2-18]