First layer height problem

Im testing out the new Slic3r 1.2.5 experimental.
Im having problems with the first player of the printing.
What ever i try to do my first layer start at 0.9mm over bed as a bridge.
The brim and skirt starts at 0.3 as normal but when the brim and skirt is done the z lift to 0.9 and start the print as a bridge.
This is a new kind of problem i never encounterd before. The earlier versions is no problem.

Anyone got an ide of what it can be?
Heard somthing about AIRlift on uther slicer programs

Well i find something called Raft. and that was set to 1 for somehow
changed this to 0 and now its fine