I use Poser to create series of images for comics and like to name them sequentially. I had no prblem doing this when I had a PC, but suddenly, now that have a Mac, I'm having to work a little harder to do so. When saving a rendered image, I used to be able to click on an existing image and the name of that image would appear as the name of the image I'm saving. Then I could just change the last digit to make a new image or just save over the existing image if needed. But now, the existing images are greyed out, and when I click on them, nothing happens. I then have to type in the entire new name of the image. It's not a huge problem, but it is a little time consuming.
You can see what I'm talking about in the attached image. This hasn't happened (yet) in any other applications, so I'm wondering if its a Mac thing, a Poser thing, or what. I have Poser Pro 11. Any suggestions would be greatly appreciated.

Fo example, in the above image, after clicking on the existing image, the "save as..." field would hopefully read "Scene57-00", but it doesn't change.