BUG.

If you open several documents in Acrobat Pro and close them all using X button in top right corner of the window (which closes all tabs at once), page position and bookmarks are not saved properly.
Page position and bookmark position is applied according to document which was in an active tab when you closed the window.

Example.
Open doc1 at page 10. Open doc2 at page 20. Both are opened under different tabs in one Acrobat window.
Close the window using X button. Prompt will asks if you want to close all tabs. Confirm and close.
Now open doc1, it will be opened at page 20, not 10. Also bookmarks will be messed up.