@krabat you have two versions of Press This installed — one in wp-content/plugins/press-this-master/ and one in wp-content/plugins/press-this/. Delete the press-this-master one.
Better yet, remove both of them and install it from the wp-admin interface directly.
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@krabat As for the original issue, it may depend on what URL you were bookmarking. Without more information, not possible to debug.