i assume that you unplugged, and replugged the ext port, and checked it after. sometimes if the ext is attempted to be used during the reboot, it will lock up.
also, when you pull the cfg that is a snap shot of the cfg. when sending the cfg you revert to the snap shot plus your changes. negating any other changes to the cfg that occurred between your pulling the cfg, and the cfg being sent. this includes if you use the immediate, when free, times etc. options. it can revert passwords, and other items as well to the status of when you pulled the cfg. rememeber this when waiting any time between pulling, editing, and sending cfg's. i try to only use immediate, and no longer than 15 minutes between pulling, and sending cfg's.
if anyone else has access to manager, make sure they do not use it in between your pulling, and the actual sending. including if there is another instance of manager elsewhere on the network. a good practice is changing the password so it can not be done, before you pull the cfg you are going to change.
your cfg can change the pw back when it goes through.