Agent -
I have the version on the market, 1.5.3. If you have it installed, I have no clue why it won't run. It works perfectly fine on mine. Is there anything running in the background that might be interfering with it, maybe?
Obsessed -
Are you unmounting the /extsdcard or /sdcard? When you try to access the relevant folder in Root Explorer, does it tell you that it is unmounted?
The Edge is a little weird. The folder "/sdcard" is actually your internal memory. However, Angry Birds and other application still
act like it is the sdcard. For that reason, I don't think just pulling out the sdcard will work. In addition, you won't have any luck unmounting it from the settings menu. Unfortunately, the /sdcard will still be mounted, so you'll still get the error messages. Most likely, your only option is to manually unmount your sdcard from the terminal window (one big advantage of swapping the two drives - switching /sdcard for /extsdcard - is that you'll no longer have to worry about that problem; you can just pull out your sdcard).