Upgraded to 1.0 and cannot edit config.txt

Ohh, look at that - have a problem after upgrade on 1.0 and found out the very same issue (while in it would like to handle the LED’s as well).

Just my 2 cents around the issue.

They stated somewhere the OS is with a upgraded filesystem, in 1.0 and newer, to better handle SD cards - so maybe it’s the reason.