Hello John, I am a week working with ECW images in ArcPAD 10. It seems that in in the ArcPad PC application there isn't any problem, they are displayed, a worked fine, with no crashes. But using they in a mobile device, or pda, ArcPad 10 shutdowns suddenly without notice, that with render they unsuitable for field working. The same images worked fine in ArcPad 7.1 with the Erdas plug-in.
Alejandro Robador
Geologist
Geological Survey of Spain (IGME)