@nyaruko said in Qt warning of type conversion already registered:
I have a multi-thread Qt program...
This is a common cause of issues of all flavours. It may be as simple as the same setup code for shared configuration, e.g. the metatype database, executing in multiple threads.
@ocgltd said in Qt warning of type conversion already registered:
Any way to track this down?
You could provide a minimal program that invokes the message, some basic Qt version information, tool chain information, etc. Something that happens twice in ten years here and spans many Qt versions is not likely to have an immediate, "I've seen that before," response.