Thanks Dave. I've replaced the line with RaiseEvent(Thisform, "Refresh") and it works fine. I just need to wait for it to fail again :-) I'd not heard of RaiseEvent before, what can I expect to happen when it fails again?
I'm certain I haven't any subclassing although all my controls are subclasses of the originals but there is very little further code needed. The form has 2 methods to enable and disable all the controls on the form but I have been using them for years without any problem. John John Weller 01380 723235 07976 393631 > -----Original Message----- > From: ProfoxTech [mailto:[email protected]] On Behalf Of > Dave Crozier > Sent: 13 October 2017 13:33 > To: [email protected] > Subject: RE: Odd Behaviour > > John, > Just try and use > RaiseEvent(Thisform, "Refresh") > > I know it shouldn't cause any problem but it will allow you to trace into it. > > Sure you haven't got any form subclassing code somewhere? > > Dave _______________________________________________ Post Messages to: [email protected] Subscription Maintenance: http://mail.leafe.com/mailman/listinfo/profox OT-free version of this list: http://mail.leafe.com/mailman/listinfo/profoxtech Searchable Archive: http://leafe.com/archives/search/profox This message: http://leafe.com/archives/byMID/profox/[email protected] ** All postings, unless explicitly stated otherwise, are the opinions of the author, and do not constitute legal or medical advice. This statement is added to the messages for those lawyers who are too stupid to see the obvious.

