Once more I lost all my saved fittings due to this bug. Luckily I had made a backup this time and was able to restore most of them, but could you please look into fixing it in the next release? I can't imagine it to be a huge amount of work..
Not sure how it's implemented, but I think just throwing a warning and discarding the changes should be enough. This way you only end up losing the changes done in the last session, not all your saved fits.