I have done some further investigation. If I use the put in a lat/long coordinate without spaces, use the symbol for degrees instead, then the find tool works. I use the syntax "alt + 0176" to get the degree-symbol (°).
The help text still says, that space will be understood! But its not.
To summarize: To get a lat/long posistion to work in the find tool in arcGISexplorer desktop, the syntax must be like this:
degrees, minutes, seconds
<degree>(alt+0176)<minute>(apostroph)<second>. Example: 78°30'45 16°45'30
Degress desimal minutes
<degree>(alt+0176)<minute>. Example: 78°30.75 16°45.5
Desimal degrees
<degree>. Example. 78.575 16.755
This can work for me, but not if ArcGISexplorer should be used by little trained rescue offiecers who has focus on an accident or case somewhere, not on syntax and shortcuts.....
I am still hoping someone can help. Maybe I'm wrong or maybe ESRI can fix this in a patch or?