I have had this issue for quite a while, and have found no info to help me. Also, the issue doesn't always show up. What is happening is when I select something with the marquee tool, the selection doesn't start at the position I click. It's usually a few pixels off. It also does this with the ruler tool. I'll click at a point to start measuring and the ruler starts at a completely different spot. Really annoying! Anyone else have this problem and/or know a way to fix it. I'm using Photoshop CS4 btw. Thanks!
I've seen this before as well. I was able to fix it by disabling “Use Graphics Processor” under Preferences / Performance (I'm using CS6, so the names may be slightly different).
There's a little more discussion here: Photoshop: Inaccurate selections with Radeon graphics cards on Mac OS
Of course, disabling GPU will slow things down...
It's worth noting that I'm not seeing this issue now (CS6 / 10.7.3 / Mac Pro / ATI Radeon HD 5770).
answered Apr 24 '12 at 12:20
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Hmm, I may try that. Don't want things to be slow though :( haha. Thanks! – ansarob Apr 24 '12 at 18:14
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I had this problem when using CS4 + XP64. However, when I upgraded to Windows 7 and CS5, the problem went away (I'm probably also using newer drivers than I had back then). I guess Mac users will have to either dualboot Windows 7 and buy a Windows license for Photoshop, or file a bug report with Apple and ask them to fix the drivers. – Lèse majesté Apr 24 '12 at 22:09
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1@Lèse: I'm not seeing the issue now. When I saw it, I think I was using CS4 and a different Mac. I haven't seen it in a while, certainly not with CS6 and my current Macs. – Marc Edwards Apr 25 '12 at 0:23
I have had this problem myself in Photoshop CS5 running Snow Leopard on a Mac Pro. No graphics setting changes have permanently kept this issue from coming back up. However, when it does, pressing F to cycle through screen modes clears the issue for me.
May be the pixels from the marquee tool (select range). Start by selecting the inner pixels. For example, if a box is 250px wide, start by selecting from the 2nd pixel.
