Someone asked about the diagonal line on my Charlieplexed display sketch. It's what I refer to as the "float" pin and it's connected to the LEDs that occupy positions in the matrix that would otherwise share a common column and row (RB0/RB0, RB1/RB1, etc.).
I apologize if the diagonal line has thrown you off. It's a remnant from some of my sketches of Charlieplexed 7-segment displays.
Both drawings below are electrically the same but the second drawing below may make more sense. Basically I just slid those LEDs in the bottom row up into the empty spaces in the matrix.
Kind regards, Mike
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