I just upgraded to InDesign CC 2015 from 2014. Opening my previous files, everything looks good, except when I zoom out in normal screen mode. Suddenly markups appear all over the page (strikethroughs, marked out text) completely obscuring my ability to see my text accurately. If I switch to preview mode, or if I zoom in a little, the marks all disappear. I need to be able to view the material along with the columns, guides, margins, etc.
UPDATE: If I go to Preferences > Display Performance and change "Greek Type Below" to 0pt, the problem disappears.
Obviously not a "fix" but I can work with that for now. Hopefully Adobe will fix the bug.