I had to reformat my computer recently, and upon reinstalling sibelius I have a weird playback problem where it's swinging the 16th+ notes.

8th notes sound fine, but 16th and 32nd notes sound really shuffled. My best guess was that the performance was changed to a swing feel, but it is set to a "straight" rhythmic feel. I have no idea why it's doing this.

Does anyone have any insight on this or know of a way to disable the performance feature completely?

Hi Justin - this sounds strange. In the performance window, you might try setting the "rubato" selection to "meccanico" and see if that helps. Is it a literal swing sound, or is it more sporadic and jerky sounding? This might also be worth checking with the Sibelius folks to see if they have a quick suggestion.

jim