Selecting “close group” on program produces errors, but only SOMETIMES

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Visual Basic
First of all, hello everyone, and thanks in advance for any help or information. Here's a little background. We are developing an application in Visual Basic 6, running on Windows XP (service pack 2), and it is being tested by some QA people. They came up with an error that can only be reproduced on their machines. It doesn't happen on our development PCs when we follow the exact steps. And I am trying to figure out why that is, and more importantly, fix it. Right-click the taskbar, hit Properties, and check the box that says "Group similar taskbar buttons". When several buttons appear in the taskbar, this will group multiple instances of the same program together in one button. If you right-click this button and select "Close group", it shuts down all of those instances together. When I have my program open, and a few other forms open in it besides the main one including an "Open file" type dialog, these all get grouped together into that single button. Selecting "Close group" on that button closes them. The problem is, this causes a run-time error on the QA people's PCs. But it closes fine with no errors on our development PCs. Everyone is running WinXP, service pack 2. I've tried it with and without .NET installed, that seems to not make a difference. Does anyone have any idea what might cause this, or why it might error on certain PCs and not on others? Any help on this would greatly be appreciated. Thanks, -Bradley-

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first step : cross your pcs and profiles : try on dev pc + QA profile, then try on QA pc + dev profile. Who has the error sticked to the shoes ? the pc or the profile ?

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