Today I was hit by the same bug (FM2015, fully patched to the current version). MIF wash didn't help. Then I tried the route of creating a completely new document (not using the existing, buggy file as a template), but instead using an empty standard template and importing the formats from the buggy file afterwards. Without the content the bug was gone and tab stop editing worked as expected. Then I copied the whole content of the old file to the new file, and the bug was back. Now I deleted everything again, and the bug was gone again. So the bug was content related. Cutting a long story short, I was able to track down the culprit to… an imported PNG graphic. Yes, really. Copied the anchored frame with that graphic into the new file, and boom, there was the bug. Deleted just the graphic (keeping the frame), and it was gone again. Replaced the PNG with a TIF version of the same image, and the bug remained gone. Now my document is fully working again, and I'll never use a PNG again. I did it this time only for developing a preliminary layout, and the PNG was a file from our customer which I didn't want to use later anyway, so it was just for testing purposes. I usually only use TIF or EPS files for pixel images. On a side note, this specific file with that PNG image worked correctly in FM2019. So maybe all of you with FM2015 hit by this bug, check your documents for PNG files…? Bernd
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