I have been away from ESO for about a month. When I logged on yesterday, I noticed that the slotted ability boxes were blank. I went to the skills menu and all of the skills I have accumulated since June were gone. I did not have the option to assign a skill. The skills I have for the character, have the mark beside them showing that I have that skill. I have 5 characters and only checked two of them. Both are like this. I can't pretty much play at all since I can not use magic or any other skill that you could slot. I did not try exiting the game and will check tonight. I still have my weapons and armor. I checked my level 21 and level 17 characters. I really don[ want to start over with a new character.
Tarkus Aquila - Imperial Templar
Klaaz - Khajit Nightblade
Fractiz - Altmer Sorcerer
Jonsir Vheti - Dunmer Dragonknight
Kills-With-Grin - Argonian Dragonknight
Myrddin the Mystic - Breton Warden
PS4 ESOTU Adventurer since June 2015