Inputs and outputs doesn´t show in multirack

It would appear that even though you've clicked on the I/O icon above the tracks, the display hasn't switched from the EQ setting. There's no obvious reason for this happening, and immediately I can only think of one thing you can try (other than clicking on the two arrows icon again and seeing if it changes) and that is to go to Edit>Preferences>General and if the 'use hardware acceleration for drawing' box is checked, uncheck it and restart. Or vice versa. Please report back.