QuickTime "lock out" while exporting?

I have an app that tells QT to export the front movie. During the export process, if some other app is made frontmost, it is impossible to make QT the frontmost app again (by clicking its Dock icon, for instance) until export is complete. Additionally, the script app itself cannot be made frontmost while QT is exporting. Does anyone know why this is and is there a way to workaround this behavior?

The export is done in the same thread as the GUI. You can’t change this.

You may be able to get the app’s window(s) to jump to the top with Expose or app switching. They likely will not respond from other methods of activation.

I thought the reason would be something along those lines. Ah well. Thanks!