I am using NT 7 RC1. The same problem occurred in earlier versions.
Basically, loading up the Output Window does not always produce the same results. When I launch a new workspace (e.g. Untitled1 in first screenshot) and then try to open the Output Window there I get the tab at the bottom of the screen but the actual window is not visible. The same occurs when I try to load it up in certain, saved workspaces (e.g. Monitor). However, when I load it in another workspace (e.g. $AUDUSD) the window will display as expected and I will be able to use it.

In addition to this, sometimes some data is printed out rather randomly in the Output Window - and I can assure you that this is not related to any of my custom indicators.
I would suggest you look into this before NT7 goes into production release.
Thanks,
Stopped

PS: I will send an E-mail to Support too, with traces.

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