I am copying and pasting straight from MMF editor into MMF editor, from frame 2 to 1 in fact.
I've tried various settings of the little fish icon to no avail. I think whatever broke, MMF doesn't appear to have the controls for it(or I don't understand where the copy and paste setting is).
When I copy the second frame's pixels and paste it into the first frame, I get white pixels filling in all the transparency of the pasted pixels.
This is with the Steam version of MMF2.5+, so I assume the latest version. I can attach a screenshot of the process here if needed.
My settings on both frames for the fish was to set them to "transparency", though I have tried various alternative settings to no better result.
The image in the first frame was imported, I can attach the imported image as well. It was from a resource bundle I purchased, but supposedly is normal png file(everything else like Unity opens and reads it fine, even gimp or other graphical editors. MMF just starts doing strange things to itself in the sprite editor.)
As you can clearly see, it's just a png meant for a background that I've edited in MMF to make it shorter.
For the record, the second frame is just the result of making a string in MMF itself, then right click and getting an active object off using the "Make active object" function. I then copied the frame from the new active into the one with the panel to edit them together into a single object.
So I guess to recreate:
1. Import the png
2. Create a string object, set it's font to whatever, and create an "active object" to get a sprite frame out of it.
3. Copy that sprite frame into the png object as frame 2.
4. Now copying frame 2's data with the box selection will result in pasting white instead of transparent pixels into frame 1, which makes adding the text and background together much more difficult then it should be.