PrinzAxel

Has anyone experienced a situation where simple buttons and checklist boxes end up missing on a form when you run your application - for me this is intermittent and I can't determine what conditions are needed to repro the issue. Actually what's strange is that the checklist box is populated but there's no text - but I can click on the items and the border around the item is visible. So far this has only happened on two of our inhouse machines, which are both Dell laptops - there haven't been any reports from customers - the application is 20 years old and I upgraded it from D6 about 8 years ago and have then upgraded through each version up as far as Sydney.

@Lars Fosdal yes the buttons are positioned correctly in the hierarchy.

@limelect & @Koru I really appreciate your thoughts and comments and I totally agree with your methodologies for breaking down the problem. Unfortunately the latest/second machine that I was going to troubleshoot this morning is in India and when we looked at it this morning we couldn't get a repro. I've gone through the code with a fine tooth comb and anywhere that I suspected that could cause problems with the population of the checkbox list would have led to real problems such as AV. The missing buttons are simply 'OK' and 'Cancel' bit buttons that are not manipulated in any way and just do exactly as titled.

@limelect I appreciate your suggestion and understand where you're coming from. I don't think it's necessary to take those steps because the application is currently running on thousands of machines without a problem. So far it is only two machines and as of this morning having tried the most recent machine I cannot get a repro again. The affected window has not been edited in four years so there haven't been any controls added or moved etc. I'll keep hunting, Cheers, Aidan.

This is only the second inhouse machine that has shown the issue. Both computers are Dell Lattitude 7400s running Windows 20 20H2 and are patched with security and driver updates.

It is a VCL application. Yep I mean for a given application it can work over and over and then without knowing when it can fail. Other controls such as labels, checkboxes and radio buttons appear normally. My next step is to create a new simple program with the same controls and see what happens. Unfortunately the computer that it is happening on is in India and I'm in Ireland. I hope to try remote debugging and maybe use Marco's Object Debugger as well.