I'm having this problem when exporting dpx files. It's a little annoying trouble, maybe you have some clue... I'm on a MacBoo Pro and dealing with Redcine-X build 351. I enter the output location and the output filename as Redcine-X ask me to do, BUT after exporting I find out in the explorer window that it doesn't keep the filename I entered, it just uses the original name.
This makes me to change the dpx file names afterwads, which is quite a bit annoying.
I appreciate your help! Hope anybody knows. Thank you.