When you say it will not measure, where / how does it fail? I also was having challenges reading charts, custom ones I made, in iProfiler 1.6.1 on a Mac, using an iO table with and i1Pro2. Working with X-rite I discovered that if your chart has the column letters parallel to the long direction of the table all will read without incident. However rotate the chart 90 degree, as I can with some of my custom charts, and you may or may not have a successful read. That said, I printed out the iProfiler supplied IT8 .7-4 CMYK random target and was able to read it in Dual Scan mode without incident. Do to the size of this chart, it forces one to position it “correctly". Interesting is that the chart I used only had 1617 patches, I could not find one with 1620 patches. -Bill-