Rocks'n'Diamonds

To reproduce the bug, simply load a new level in the editor and add player 2 near player 1. Then, start the game in multiplayer mode, and move player 1 to the left (or the bottom.) When he is near the right (or bottom) edge of the screen, the playfield starts scrolling, and almost immediately player 1 cannot move any more in the same direction. No problem with player 2! And after having used player 2, player 1 can move freely. Strange.

This is not a bug.

This behavior happens because by default, a player cannot move off of the screen in "Focus on all players" mode. If you press F5 to focus on Player 1 or F6 to focus on Player 2, you should be able to move the selected player freely.

Press F9 to (attempt to) return to focusing on all players.

Ah, OK! I haven't understood the "focus on all players" till now. Thanks for the precision.