When I import a Simatic Step7 project in the zenOn editor, my datablocks are visible, but no variables are shown in the list. When I double click in the list however, variables are added!
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If you can't see the variables, but you can add them, the columns in the import window are probably all disabled. To add the columns, right click on the top-side of the list-window and choose "column selection". After adding all columns, the variables should be displayed.

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