Unable to open packages

I’m just starting to use Studio 2015, and while I can work on a single file I’m unable to open packages.

I’m only able to get to the window “Review package contents”.

After that everything is frozen, except the “Browse” button (which has a white exclamation point in a red circle next to it, which may or may not blink).

When I click on “Browse” the window where I’m supposed to select a folder does open, but as soon as I try to move the cursor to that window it disappears.

And that’s all I can do. For anything else Studio is frozen.

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