So how does that work then ? ACPU resizes the charts on Windows by about 6%.
Yes, on Windows there is a bug (OT but Adobe once fixed it, but I don't believe ever released it; I have a copy

)
So the big issue with scaling occurs with auto Spectrophotometer's like my iSis. If the patches are off, it barfs. MY target takes into account this possibility such that even
if scaling occurs, I can measure MY targets without issue. If you're using a handheld device, that scaling will not have any affect unless of course you end up printing patches outside the margins! My targets don't do that.
So again OT but yes, there's a bug in ACPU on Windows that
can occur. But no, it doesn't provide any issues for me with my auto Spectrophotometer and my targets. I have literally hundreds of saved CGATS files from customers all over the world, Mac and Windows and IF the user follows my instructions, I can and I do measure their targets printed from ACPU. All the time.
For folks building their own profiles, this is totally moot, the product creating the targets should print them without color management. For a dog like me, who has to deal with customers all over, with differing operating systems and copies of Photoshop, it should be a major PITA using ACPU but the facts are, outside of user error, my targets measure just fine.