I have an odd behaviour happening in Photoshop that I can not figure out. I have asked students to crop using the crop tool to 8in x 8in @ 200ppi. We are using the W x H x Resolution option. Some submit the work, and it is accurate. Some submit the work, and the crop is off. It shows 7.71in x 7.71in. It also produces a thin white line along the bottom for some. We have reviewed it in class. I have demonstrated it using my computer. But yet, for some, it still shifts.