Hi, long time lurker, first time poster....... I have a 2.26 Quad Core Intel Xeon, technical info: Model Name: Mac Pro Model Identifier: MacPro4,1 Processor Name: Quad-Core Intel Xeon Processor Speed: 2.26 GHz Number Of Processors: 2 Total Number Of Cores: 8 L2 Cache (per core): 256 KB L3 Cache (per processor): 8 MB Memory: 6 GB Processor Interconnect Speed: 5.86 GT/s Boot ROM Version: MP41.0081.B07 SMC Version (system): 1.39f5 SMC Version (processor tray): 1.39f5 Serial Number (system): CK94104VBXD Serial Number (processor tray): J593500H71LUE Hardware UUID: DF752122-3C36-59BE-BF10-69F71787C0A9 I have recently had to downgrade(?) my monitor from a 2007 23" Apple Display to an LG E2350. Since then I have been suffering from some serious video playback/stuttering/crashing issues in both adobe premiere and in pro tools/logic when working on sound for picture, to the point that I cant actually work on the project. This problem occurs when the monitor is connected by both mini-display port > HDMI and when it is connected by an apple dvi > vga adapter. The problem is also not file size dependent.... I have the same problem if the video file is 1gb or 10mb. The ONLY difference in my setup is the monitor. Prior to the downgrade there were no problems what so ever and everything ran perfectly. Can anyone help a not-so-video-tech-savvy brother out?