This showed a crash screen on any Flash Player applet in Firefox. Keeping Firefox open, I used Task Manager to kill the 'plugin-container.exe' process. This is damned annoying, I said to myself, and decided a little hacker mode was in order.
Because the desktop speakers are considered the most recently plugged in device, they would be default for plugins. This entailed unplugging my headset, shutting down Firefox and opening it up again. The USB headset would take precedence over the USB iMic for applications because apps appear to access the last device plugged in to a USB port. Two audio devices are available to my XP box: an iMic USB audio I/O device, in which I have permanently plugged my desktop speakers and a pair of USB headphones with microphone that I plug in occasionally. I had an issue until a few minutes ago regarding this.