We have the same problem on Mac Pro and Imac 27" running OSX 10.10.5. This appeared about 2 months ago with the following build: Acrobat Pro Architecture: x86_64 Build: 15.16.20045.188096 AGM: 4.30.64 CoolType: 5.14.5 JP2K: 1.2.2.36256 This bug makes commenting useless. Also deletes comments when opening. All files not just one file.
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