The code is on a command button. I added a couple of messagebox for tracing

In abbreviated form it's

oMyVBObject = CREATEOBJECT("xxx.Fetch")


oMyVBObject.ReadCSV( passed parameters)

...at this point the VB dll executes correctly and finished.

select table
APPEND FROM "tmp3equities.csv" && appends result files created by dll

thisform.lblStatus.Caption="Finished" <<-- this works

=MESSAGEBOX('Trace before release') << this works

RELEASE oMyVBObject

=MESSAGEBOX('Trace after release') << last statment in cmdButton code - works

At this point the VFP program terminates with no error