Windows 7.1 SP1 - Listbox Check Redraw Problem

Environment

On some installations of Windows v7.1 SP1 (minimum installation requirements for PergamonMU) a bug has been recorded across all software utilising the Xojo Development environment, and by a range of manufacturers. This bug results in the checkbox component of list boxes not redrawing with the correct true / false / indeterminate setting.

While a visual problem only, it does result in users not knowing what the current settings of a value is and therefore inadvertently saving incorrect values.

In some functional areas, this results in the software being effectively unusable due to consequence.

As Windows 7.1 SP1 is the minimum specification for Xojo software running on Windows and is also no longer supported by Microsoft, a 3rd party solution is unlikely.

Esferico are currently developing a custom solution with our own checkbox images, not relying on the built-in controls within Windows.
UPDATE 2017-09-01 - Custom solution introduced with release v1.0.96.