I have a fix. I did a little research and found that you can edit /etc/permissions/platform.xml and add a group to WRITE_EXTERNAL_STORAGE
Original:
<permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
<group gid="sdcard_rw" />
</permission>
Add the media_rw group:
<permission name="android.permission.WRITE_EXTERNAL_STORAGE" >
<group gid="sdcard_rw" />
<group gid="media_rw" />
</permission>
Done. Doing a TiBU right now to my external card.
This _may_ fix other apps that have issues writing to the card, I personally didn't find any.
Suggest that you do an adb pull of the file for safekeeping before doing this.
If you pull the file, edit it, and push it back make sure the permissions are set to 644.
Thanks to everyone who made this "OTA" happen.
I was able to do a no wipe update to MH1