As the title says, is it possible to animate a walkcycle and then stack the action in the NLA editor multible times? Because it doesn’t work for me.
yes, you can use the Repeat strip property to repeat an action n times.
But for some reason that doesn’t work, when I change reapeat to 3 for example, the strips gets divided into 3 parts, but when i play the animation (alt+a) the action only plays once. The Stride option doesn’t work either, when i tried using paths.
You are probably in individual action mode. When you switch to NLA mode, the properties you set in that panel will be honored. I just went thru this very same issue and updated the wiki to make this clearer.
Yey i got it working, it was the action thingy 
Thanks!