MessageBox in worker thread

Question

I have an application which calls into plugin DLLs. Some of those calls are done from a worker thread (i.e. not the UI thread), and just might popup a dialog with MessageBox. According to this (http://www.codeproject.com/Articles/121226/MessageBoxes-and-worker-threads) the effective UI thread is switched to the thread calling MessageBox. This "crashes" the application since the message pump stops receiving messages. Any way to switch back the UI thread to the correct one ? Any work-around ?

Answer 1

The culprit was AttachThreadInput, see this message.