Since I updated to version 4.4 I have two problems:

1: Approaching EHAM rwy 27, I wanted to delete the transition because I was being vectored to the runway, after selecting the second to last waypoint before the runway and entering that one as the first waypoint to fly to, all waypoints disapeared, the only thing left on the legs page was vectors

2: after taking off GCLP, when activating the AP I allways fly the plane in heading mode because the DME Arc is not in the STAR, as soon as I've flown the ac to the first waypoint after the DME Arc I want to switch to LNAV (Which is allready armed on the runway), but as soon as I want to do that the aircraft turns 180 degrees and heads back to the previous waypoint which isn't on the legs page anymore.
I found out that switching to LNAV right before a waypoint works fine, but when, say, flying halfway inbetween two waypoints it allways turns back to the previous one.

Hope someone can help me out here, because this kind of behaviour is no fun when flying online, ATC doesn't like ac making 360's halfway down a SID  :D

P.S. I've read the FMS manual but cannot find how to enter DME Arc fixes, it only describes how DME Arc fixes are presented in the FMC but not how they can be entered!