I haven’t been doing this for a while, and when I started again, I wanted to look at an old puzzle I had done, accessing it from a list of puzzles that I had completed. They all seem to have been wiped clean. Obviously, this would render the importing solution data issue useless. Is this just some glitch I have?
If you have cookies or history disabled, try turning them back on. Are you looking from the same machine?
As drake178 said, the save file only persists within a same computer (we’re trying to fix this)
If the problem happened even if you are using the same same computer, could tell us your platform(window/linux/max) and your browser type/version?