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Hi Sviatoslav, I was puzzled by this too. I don't know if this will be the same for all of us, but I found out that there was a copy of the exercise notebook stored im my wolfram cloud files. Log into your account at...
Had some difficulties using FilterOptions directly with Polygon, since an empty option list will be interpreted as the indexing form of polygon definition. So I had to use an index list as second argument and FilterRules as third argument. ...
Thanks for your answer. I have already contacted support. It seems to be a known issue on macOS and it should be fixed in an upcoming release.
Opening and debugging notebooks does not seem to work anymore with Mathematica 10 on OS X 10.9. When I try to open a notebook from Workbench, the notebook opens in Mathematica, but after a short while, Workbench displays a "Mathematica Notebook...