Friday was supposed to be the day Harry Potter and the Half-Blood Prince opened. Instead, over the summer, Warner Bros. rescheduled the franchise's latest adventure for next July, a move that caused a fan upset that hasn't entirely settled.

"I think most fans are disappointed more than angry, and definitely skeptical of the real motive behind the delay," said Sara Greer, editor of the Harry Potter fan site MuggleNet.

A fan identifying herself as Jen Stewart said in an email she felt the studio was "pandering" when it pointed out the reschedule—attributed, in part, to fallout from the writers' strike—meant a shorter wait between Half-Blood Prince and the first part of the two-part finale, Harry Potter and the Deathly Hallows.

"I don't know about everyone but I am still just as upset as I was over the summer," Stewart said.

Interestingly, the recent release of the new Half-Blood Prince trailer doesn't seem to have appeased the most seriously aggrieved. Dozens and dozens of new names are still being added to one popular online petition that's more sounding board than call to action.