Gar,

>The exact command that failed is SET DATASESSION TO (lnSavedataSession)
>(lnSaveDataSession is not set.)
>
>It was called from just2.oenvironment.osessionevironment.set

Although I'm not sure what's happening to your form, here's some information that may help...

All form classes in the Framework contain a "SessionEnvironment" object. When the form instantiates, the SessionEnvironment object calls up to a global instance of SessionEnvironment to retrieve any "application-wide" default session settings. When it does this, it passes its current data session number to just2.oenvironment.osessionenvironment.set().

I recommend setting a breakpoint in your form's SessionEnvironment object's Set() method as follows, and tracing through code:

SET STEP ON
DODEFAULT()

Regards,