Lersus

Guys, first of all i want to thank you ALL for your great work!!! I'm encountering a rather strange bug and i don't know if this is only happening to me. My Kerbals are instantly dying as soon as i push the EVA-button. There's a "puff" sound and the Kerbal just disappears in a grey smoke cloud. It happens in space as well as on kerbin.The only Mods which i have installed are RO and RSS (via Ckan). I would really appreciate any help or advice! Thx in advance and greetings from Germany.