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Please confirm you have followed all the steps listed in Troubleshooting Connectivity Issues within SketchUp | SketchUp Help
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Please ensure that Javascript is enabled in IE (see http://www.enable-javascript.com/). The simplest choice is to set your security in Internet Explorer to Medium which goes above and beyond enabling Javascript. To set your Security to Medium in Internet Explorer you can open Internet Options, go to the Security tab and adjust the slider to Medium and then uncheck the Protected Mode. Be sure to restart SketchUp after making your changes
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You can also try to delete cookiejar.xml and session.dat, if present, from C:\Users\username\AppData\Roaming\SketchUp\SketchUp 2015\SketchUp
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Please ensures that cookies are enabled for *.sketchup.com and *.trimble.com
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