>Instead of trying to guess where it happens, why don't you just suspend when it happens, open the debugger, and trace back to the offending command? AStackInfo() would help, too.

As I said before, the error occurs, esp. with a particular record, which isn't a duplicate, at the following line: either at the "With thisfile" or before .lmCompileReport(), i.e. nowhere on an executable line that does anything that would upset RI. AStackInfo() merely tells me that I'm on the printing form and that I've invoked the .click(0 of the button - nothing else.

This has got to be the most bizzare error I've ever had!

Preview button click method:

With thisform
  .lmCompileReport()
  .cmdCancel.caption = "\<Close"
  .Visible	   = .F.
  Report Form serRouteIndex Noconsole preview
  .Visible	   = .T.
EndWith

If I put a breakpoint on "With thisform", and during the run, click the button, then the err. mess. occurs sort of at the same time as debug is invoked. A window (presumably debug) flashes on and off before I can see it, the error messag pops up. When I dismiss it (it only has OK or Help buttons), and open debug, the cursor is either on "With thisform" or sitting waiting to do ".lmCompileReport()"

Any ideas, experience of similar?

Terry