Restoring and resetting the acad.cui fileIssueYou would like to undo changes made to your acad.cui file by rolling back to the previous customization state or to the original acad.cui file. SolutionTo restore an acad.cui file, in the AutoCAD Customize User Interface right-click on the ACAD element at the top of the tree view, and then click either Restore ACAD.CUI or Reset ACAD.CUI (see graphic below). 
Restore The ACAD.BAK.CUI backup file will be used. Note: The ACAD.BAK.CUI file is created when you make changes to the current acad.cui file in the AutoCAD Customize User Interface. Reset The original acad.cui file will be taken from the C:\Program Files\AutoCAD 2007\UserDataCache\Support directory.
Support – Terms of UseAUTODESK DOES NOT GUARANTEE THAT YOU WILL BE ABLE TO SUCCESSFULLY DOWNLOAD OR IMPLEMENT ANY SERVICE PACK OR WORKAROUND, OR ANY OF THE TIPS, TRICKS, EXAMPLES OR SUGGESTIONS OUTLINED IN ANY AUTODESK PRODUCT SUPPORT TECHNICAL DOCUMENTS. TECHNICAL DOCUMENTS, SERVICE PACKS AND WORKAROUNDS ARE SUBJECT TO CHANGE WITHOUT NOTICE TO YOU. AUTODESK PROVIDES TECHNICAL DOCUMENTS, SERVICE PACKS AND WORKAROUNDS "AS IS" WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL AUTODESK OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF DATA, OR LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, THAT MAY OCCUR AS A RESULT OF IMPLEMENTING ANY SERVICE PACK OR WORKAROUND, OR ANY SUGGESTION OUTLINED IN ANY AUTODESK PRODUCT SUPPORT TECHNICAL DOCUMENT, EVEN IF AUTODESK OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. | 