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Anonymous
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Warning! An error occurred in the following addon: Open GL?

I am receiving this error message after I have merged in an AutoCAD LT 2004 file. The ArchiCAD file seems to work okay until I save it, close it, and then try to re-open it. After re-opening the file I get the error message and then nothing appears in the 3D window. What gives?!?! Can anyone help?
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