Comment 4 for bug 586373

To reproduce this, enable Orca in the Live CD. For the first 30 seconds after boot, press space bar every 4 seconds. There is a screen at the beginning of booting that expects you to press a key to get to the old boot menu. You should be at a screen asking for your language. Press Enter to select English. Then press F5 to open the accessibility options menu. Press 3 to turn on screen reader, and Enter to get back to the boot menu, and Enter one more time to start the boot process.

Orca should come up by default in the Gnome session, with the preferences dialog box showing. You can just click Cancel on the Preferences Dialog, and manually run System/Administration/Startup Disk Creator. I'll leave it to the reader to find some ISO somewhere to burn, and a USB key to format. Once you've done that, press Make Startup Disk. The progress will be shown with a progress bar. Everything works fine until the end, when the application tries to exit. At that point, the Gnome desktop locks up and becomes unresponsive. However, your USB key is ready for use, since the whole process actually worked. Let me know if there's anything else I can do.