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I don't know if these two problems are related. I am working on an older iMAC OS X El Capitan 10.11.6 which is not supported to be upgraded any further. I did inquire about whether the latest AP upgrade was OK for this OS version and was assured it was fine. Recently I've started having a problem when I merge layers. Each layer becomes fuzzy as I merge. Interestingly it doesn't seem to be progressive. It also seems to be taking an extremely long time for the merges to occur most of the time, and I am wondering if the length of time is affecting the degree of fuzziness. As an example: I am creating a calendar that is designed to look like cross stitch. I created a master "sampler" of the numbers, and the upper and lower case letters, I then copied and pasted these to form all the months. When I merged the layers the "stitches" became fuzzy to varying degrees. Each month was in order, so, with "January" you would expect the "J" to be fuzziest and the "y" not at all, since it was not merged down again. However, the "J" was the fuzziest, but both "a"s were only slightly fuzzy, and the rest somewhere in between. In "February" the "F" was only slightly fuzzy and the rest fairly bad, and in "March" every letter except the "c" was fairly fuzzy, the "c" so slightly fuzzed that if they had all fuzzed to only that degree I might not have noticed it. I sometimes have even seen the spinning wheel of death, although most of the time the merge completes and I'm fine, a few times I have had to "Force quit" AP and restart my computer. I am only having this issue with AP, no other programs.