I used to have one custom infrared command on one device that had a '/' in it. Since you cannot delete al learned command (or edit its label) I decided to create an all new account yesterday, making sure that the labels for the commands did not contain spaces or special characters.

So far, it seems to have solved my issue of automatically deleting the custom button settings overnight. :)

But when I added a new command to my DVD, I ran into the "Unable to display content" error again... So there still seems to be a problem in the amount of commands I add to a device. :(

Anyway, if it's true that using special characters in custom command names cause a lot of weird and seemingly unrelated problems, why doesn't the software check or warn you not to use them?