Describe the bug
DBM keeps resetting bar skin to "Addonskins" after reloading ui (logout/login, reloadui)

Do you have an error log of what happened?
nope :(

To Reproduce
import raid ability timeline (https://wago.io/RaidAbilityTimeline)
set using Jods_Raid_Ability_Timeline_Skin in DBM

Did you try having DeadlyBossMods as the only enabled addon and everything else (especially something like ElvUI) disabled?
only installed addons:
DBM (retail)
AddonSkins
WeakAuras

• I have done a total reset (clean install) (/console cvar_default, deleting WTF folder)

Which version of DeadlyBossMods are you using?
most current version: 10.0.20

Go into the AddOnSkins settings, and disable the DBM module :)