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I am using ArcGIS 10.1 model builder on windows 8 to create create models for my processes. But when I open the model using Arc GIS 10.1 open model for editing with Arc GIS 10.1 running on Windows 7 it appears not to be editable. I can run the model but I cannot edit it. When I open the model in ArcGIS 10.1 running on windows 7 the model appears as on the screenshot attached below...!Does anyone have an idea what the problem might be Could? I am yet to check if I will have the same problem when I try and edit the model on another windows 8 platform... The model does not use additional tool from extensions like "spatial analyst and so on..." it only uses data management tools. Thank you in advance.

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Are you saying that in Win7 your model comes up with the squiggly lines? – gm70560 May 15 '13 at 14:32
Yes, they do... Especially the tools. – GIS Joe May 17 '13 at 7:28

Take screenshots of your parameters inside each tool (or if you can memorise them, great). Drag in a fresh copy of each tool you used from ArcToolbox and delete the ones which are currently in your model. This happened to me alot when I initially was working between Windows 7 and 8, but now that I store my main toolbox on SkyDrive and sync between my home (Win 8) and work (Win 7) computers, I haven't had any problems like this anymore.

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I will try it out, thank you. – GIS Joe May 17 '13 at 7:28

I sometimes have a similar problem. Simply copy and pasting the contents of the whole model into a new model usually fixes it.

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