This issue just happened on my co-worker's workstation (ArcGIS 10 on Windows 7 Pro)... I've never seen this happen before but it is definitely not related to any layer geometry issues nor page layout guides... Those are completely different issues and have no value to this thread. I see no real resolution provided in this forum except copying the project into a new .mxd file (not really a "solution")... I believe somehow a phython logic error is occurring within ArcMap's layout rendering commands. In my coworker's project, the green lines appear after using the select element arrow to adjust the size and position of the data frame. I can make the lines disappear temporarily by simply opening the layout properties dialogue and immediately clicking "okay" (which closes the dialogue and I believe resets the entire Layout View rendering script that is part of ESRI's base ArcGIS code). I then hit the refresh view button and the lines are gone. I can then make the lines reappear by adjusting the size and position of the data frame again using the select element arrow... Nothing else I do seems to remove the lines besides opening the layout properties dialogue (which again I think completely reloads ESRI layout rendering script). One interesting note - my coworker has "rotated" the data frame view under the layout properties dialogue for this project. I'm not sure if that is a variable involved in the issue or not. I think Duncan is on to the issue in dealing with his python script generating the green lines. I hope ESRI will look into this issue more and resolve it via an update as I believe it is a software bug. hms4th
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