Can't click title bar on mdi windows

Hello everyone.

I’m having a strange issue with my app. I can’t click the title bar of my MDI windows, which would allow me to move the windows within the frame.
I also can’t click “close” or “minimize.”
The mouse itself works, the driver is up-to-date.
The version works without any issues for customers.
What could this be?
I’m a bit confused.

I’m using Clarion 11 IDE and legacy templates.
It’s a multi dll app.

Thanks!

You are saying this issue only happens for you on your computer?

Have you ruled out the possibility that one of the scroll-lock types of keys haven’t been toggled?

Do you do any key ALIAS() in your app?

Other programs do not exhibit this behavior? Other Clarion programs?

What if you sign in as another user?

Do you have a cat?

Does it also happen to you on another computer?

Are there any developer only utilities revealed when only you run the app?

I suspect that something is intercepting the mouse or the click on the title bar, and the event is running into oblivion.
But I haven’t figured out which program it is yet.
I also deactivated the virus scanner, but no success.
I’ve already updated the mouse driver. Even the graphics card driver is updated.
There are no pending Windows updates.

What if you clear out whatever ini files your app stores (while your app isn’t running), including tearoff, if applicable?

What a strange thing!

After a few reboots, installing the graphics and mouse drivers several times…and suddenly it works again.
I don’t like errors like this where you don’t know exactly what caused it.

But I have to say that the mouse (hardware) did indeed have a problem, I had replaced it, but the error was still there afterwards.

It wasn’t the program itself; I tested it on several PCs.
Maybe it was the Clarion Runtime.
Something was wrong with the system (Windows).

Thanks for all the ideas…