This is my work around and contrary to what somebody said, it works every time.
I too use Capture One, so this will work for you.
Let’s say I have 100 images to process from Photomechanic . I’ll put ONE image, say the first one from the 100 into PR6, then select the output folder, in your case the Session ‘capture’ folder. I then process that one image. Check the folder and the image should be there.
I will then select ALL 100 images and put them into PR6. I double check the destination folder is the last one you processed into, it should be. When you go to process the 100 images you will get a pop up warning box saying there is a duplicate image in the destination folder, click OVERWRITE. The process will then start and all should be fine. 