When working in Topaz Labs Studio, I have to retype the file name for every change I make. The software defaults to the name in my camera (a series of numbers). Every edit requires you to rename the photo. You can use the windows ctrl c and ctrl v for copy-paste, but come on. That is old school. Just remember the last file name I saved. Gigapixel does it correctly and adds a GP to the name. Topaz Studio has amnesia and reverts to the camera photo number.
Perhaps I’m confused. Are you referring to a Studio version other than 2.x? (ie v1)
