For months now this has been broken with no sign from EA about fixing it , They do the vampire run fine indoors but as soon as they go outside it stops , This has been going on now for over a year , ...
Ideas
I'm sure that's annoying, especially if vampiric run is your preferred type of vampiric movement, but you might consider using batform or mistform while you wait for vampiric run to be fixed.
I prefer batform because it's available much earlier than the other two, only costs 1 point, can get you to places you can't reach by running, and has a special woohoo if you can find another vampire with the batform power.