When I've double clicked in a block would appear a box "Enhanced Attribute Block". But now it doesn't appear anymore. After to double click, the screen freezes and I don't get do no operation more. It is necessary to press ESC to release the software to new operation. How to solve this? Thanks in advance.
it's off-screen based on your description: did you recently change from a dual-screen setup, or external monitor, or do something else with your display? It's still there ("freezing symptom), you need to find it. You could simply 'restore down' but not minimize the AutoCAD program window and see if you can spot it hiding behind something near the edges of your monitor.