Hmmm I’ve also been using Premiere for years and suddenly (started in December) this error. HD clips that have been working for ages suddenly is unsupported. First I thougt it was something bad in the computer and reinstalled the whole computer and it works fine for e few days and then the same again. Been working for close to two weeks to figure it out. 3 reinstalls from clean computer and still no luck.
What the heck is going on?