There is what appears to be a bug in the framework when sending reports to Excel that results in error 1943 "Member WORKBOOKS does not evaluate to an object". The steps to replicate are as follows:
- send a report to Excel
- File/Close Excel
- Choose same or different report to also send to Excel
- Execute report
tlOpen (view Excel report) must be true

Error triggered at "this.oOLEApp.WorkBooks. Open(laFiles[lnCount])" line in
cOleCust.exportcursortoexcel()

If Excel is not manually closed or if the Print form is closed and then reopened, then the error does not occur.