Codecs grayed out in Media Creation Settings

Hi everyone,

I have a very big problem with my Media Composer Mac (8.5.0) on OS X 10.9.5.

Yesterday, I dont't why, a problem of write permissions appears on my external RAID5 Drives.

In the Media Creation Settings, the target resolution (Codec !) is grayed out and MC can't import or AMA/Transcode any single clip.

I checked the write permissions on my drives and all is fine.

Please see my screen captures to see my bug.

Any idea.

Thanx.

StephGallet