This apparently was discovered some time back by TonyPh12345 & Tinwarble …
But since i missed the “memo” (bug report) i foolishly activated the Store Demo Feature in FW 3.04.17
Which in doing so, DELETES all your user themes located in the .wd_tv/theme folder !
Lost about 5 days of theming work … *pffff* gone.
Do regular Backups and dont use the Store Demo Mode feature.
(learnt my lesson the hard way)