Clipless pedals not engaging.
About 7 months ago I bought my first road clipless pedals (Shimano 105). I had no trouble at all clipping in and out during those 7 months. Recently I started developing knee pains, so I adjusted the cleat positioning on my shoes. Now I cannot, for the life of me, clip into the pedals. So far, I tried loosening the tension, putting grease on the cleats, and switching right and left cleats, all to no avail. I can't even clip in while standing on the pedals, pushing a fairly big gear up hill.
Anyone experience this/have a solution?
(Shimano 105 PD-5700)