TestComplete cannot find visible buttons

Hello everybody,

I'm testing an application using TestComplete 14.0 on a Windows 10 computer. The application is a software controller built using Qt 5.14.2 libraries and compiled using Visual Studio 2017.

We recently upgraded the Qt libraries from Qt 5.8.0 and TestComplete cannot find some buttons anymore. Even though, those buttons are completely visible.

I've run the Report Generator application and produced a report about this issue. Also I'm attaching a screenshot about what I'm talking about. Basically, Test complete says that it can't find a button on a Popup that is visibile, saying that is not.

What could cause this issue? I've checked the button with the object inspector and the name of the button showed fits with the action selected.

Any help is appreciated.

Thanks!