Not sure if this helps.
But when the command lines dissapears I use this process:
Sometimes users get in a hurry or just aren't careful, and can accidentally drag and drop the command line area, losing it in the process. Carefully follow this Registry Edit procedure to get it back.
1. Shut down AutoCAD if it's running.
2. Click on Start, then choose Run.
3. Type REGEDIT and choose OK.
4. On the left pane, double click on "HKEY_CURRENT_USER".
5. Double click on "Software".
6. Double click on "Autodesk".
7. Double click on "AutoCAD".
8. Double click on "R15.0"
9. Double click on "ACAD-###:###".
10. Double click on "Fixed Profile".
11. Double click on "Command Line Windows".
12. On the right pane, double click on "Dock Window Position".
13. Several numbers should be highlighted, simply press "0".
14. Choose OK, then close the Registry Editor.
15. Restart AutoCAD, the command prompt should be back
Would it work for a layer dialog box?
I'm not sure, so wondering if tweaking other variables that affect the layer dialog box would bring it back.
Always a good idea to back up the registry key before mucking around with it.
