Is the chain on the same cog as the derailleur? (I generally put the rear derailleur in high gear - smallest cog with the shifter before I take it out. THen I make sure I drop the chain on that smallest cog when I replace the wheel.)
Ben
Edit: other possibilities: If one side is going in first, the rim/tire may be hanging up on the brake pad. I've had frames where I've had to stretch the dropouts apart a touch to get the wheel to drop in.
Last edited by 79pmooney; 04-11-20 at 06:14 PM.