I wanted to make several hotkeys alt+A through alt-Z go to a drive letter. I created the first hot key (alt+A) in directory opus, exported the file to use as a template. I made the rest using Ultraedit. I imported AltDrivekeys.ohk and merged it with my existing configuration. I see the hotkeys in customize>keys. The moment I hit ok, they disappear when I go back into customize>keys again.
AltDriveKey.zip (639 Bytes)
Confirmed, I see the same in Opus 11 Beta 3.
This has been fixed for the next beta.