jump next to a solid

Hi, i'm having some problems with jump. i have assigned the platform behavior to my sprite but when it is next to a solid by its side it cannot jump.

i need to assign some action to force the jump or prevent this?

thanks

are you using an invisible rectangle object as specified in this tutorial?

And the thing you are next to and cant jump. How is the collision polygon of that item?

Would be easier to help you if you could post a .capx. file.