>I addded the following code to dataenvironment.Error method.
>Why this code fails: all cursor objects exists but used() returns .f. always!
>How to dedect the table causing an error ?
>
>

*  dataenvironment.Error method.
>LPARAMETERS nError, cMethod, nLine
>
>LOCAL i, aCursors[1], cLastAlias
>AMEMBERS(aCursors, thisForm.DataEnvironment, 2)
>
>nUsed = 0
>
>FOR i = 1 to ALEN(aCursors)
>  WITH EVAL("thisForm.DataEnvironment." + aCursors[i])
>    IF lowe(.BaseClass) != "cursor"
>      loop
>      endif
>  if used(.Alias)
>    nUsed = m.nUsed + 1
>    endif
>    ENDWITH
> endfor
>* nUsed==0 here always.
>

Looks like worst-case scenario, or is it the very first table which gives you the error? One thing I wanted to try with this is to hide the 7th table and see if Cursor7 would be the one giving the error. Do this on something that otherwise works, so I'd know it's regularly detecting the introduced error.

Another thing to try - check if any of these tables can be USEd while still in the error method, and see what error you get if you try.