Unwanted FORMS 3 message

Hi,

Can anyone tell me how to get rid of the following SQL*FORMS 3 message, which has has habit of appearing just when you don't want any operator input :-

"Please acknowledge message. (OK)"

Thanks in advance.
Tony

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Tony Desborough                                                 SRL Data Ltd
Software Programmer                                             1, Perren St
Email: tony_at_bilpin.co.uk                                     LONDON, NW5 3ED