x264 (r8849) CRF mode is buggy

[japama]

System : ArchLinux 64 bits
Avidemux version : 2.6.4 (r8849) (git version)

When I encode an avi Video to an x264 video

with Avidemux 2.5.6 and CRF=18 , Final size = 7.8 Mb
but
with Avidemux 2.6.4 and CRF=0 , Final size = 68.7 Mb
with Avidemux 2.6.4 and CRF=51 , Final size = 68.7 Mb

It seems that Quantiser still stuck on 1.

[japama]

I delete the .avidemux6 directory and
everything is ok now.

it seems that the x264 profiles of previous versions are incompatible with version 2.6.4