Qt 5.5 MinGW issue

[ad5xj]

My project was designed in Linux Mint 17.3 and works very well.

However, attempting to run the same app in XP with MinGW 4.9.2, only one form outputs a warning, information, or an error???:

Invalid source devmode on start

Invalid source devmode on start

To copy to clipboard, switch view to plain text mode 

The form is a QDialog which starts a Printer Dialog and-or a Print Preview Dialog.

The message occurs as the form is loaded before the first line of the constructor and not in any function after.

In every other respect, the form operates as expected.

I have no idea what this means nor where to look for an answer.
Is it worth pursuing or should I ignore it on Windows?
Has anyone encountered it before?

Help would be appreciated.

[d_stranz]

I assume you rebuilt all of your code and are linking to the right Qt and Windows .libs and that the corresponding DLLs are the ones found first by Windows when it looks in your PATH? And that you are not accidentally mixing Debug and Release DLLs with your EXE?