Ok I am new on here & couldn't find an answer or another thread discussing this. Please move it to the right Forum if I have placed it in the wrong one, Thanks. Ok so I am working in Adobe CS4 (Photoshop) & I am seeing grid boxes when I am zoomed at 600% all the way up to 3200%. I have looked at identical files in CS4 on a Mac G-5 & they don't do this. Below you will see a snap shot of what I see & the I-Mac info... Does anyone know if this is something that can be turned off?? I looked in preferences in CS4 but, saw nothing to turn it off. Thanks in advance, Jason. Specs: Hardware Overview: Model Name: iMac Model Identifier: iMac11,1 Processor Name: Intel Core i7 Processor Speed: 2.8 GHz Number Of Processors: 1 Total Number Of Cores: 4 L2 Cache (per core): 256 KB L3 Cache: 8 MB Memory: 8 GB Processor Interconnect Speed: 4.8 GT/s Boot ROM Version: IM111.0034.B00 SMC Version (system): 1.54f33 Serial Number (system): --------------------- Hardware UUID: 6764133A-6CDD-5034-B5F3-C4D9F8BB4351 ATI Radeon HD 4850: Chipset Model: ATI Radeon HD 4850 Type: GPU Bus: PCIe PCIe Lane Width: x16 VRAM (Total): 512 MB Vendor: ATI (0x1002) Device ID: 0x944a Revision ID: 0x0000 ROM Revision: 113-B9110C-425 EFI Driver Version: 01.00.383 Displays: iMac: Resolution: 2560 x 1440 Pixel Depth: 32-Bit Color (ARGB8888) Main Display: Yes Mirror: Off Online: Yes Built-In: Yes Connection Type: DisplayPort Cinema HD Display: Resolution: 1920 x 1200 Pixel Depth: 32-Bit Color (ARGB8888) Mirror: Off Online: Yes Rotation: Supported Below pic is zoomed in at 3200% .