Stop button not working... (1 Viewer)

[MJRL]

I've donne a lot of search, sorry if its in front of my eyes but i couldn't find anything like this.
I have a Zalman 160+ that came with a Imon LCD and remote, in the imon configs i had media portal, and assigned wmc keys. All the keys are working in media portal except the stop key of my remote, any tip?

Thanks