? a bug with version 4.7.1

I upgraded to version 4.7.1.,The last version i was using before upgrade is version 4.6.1

Following upgrade i used version 4.7.1 to edit a hepx file previously created by version 4.6.1 just to discover that all visual controls are marked distorted or totally disappeared. The tree in the menu bar items and child items are changed and distorted in a very bad way that is totally different from my plan. all items in the contents bar and tool bar totally disappeared. Probably version 4,7,1 is not compatible with hepx files created by version 4.6.1.

Please tell me how to fix that. in the visual controls. i want to move some child items to become items.
the screen in contents bar context bar and tools bar are blank, how to fix that

Your HEPX file was somehow corrupted.

If you open it in a Zip archiver like WinZip, WinRAR or 7-Zip, you’ll see a list of files.

The fileprop.xml file was incorrectly formatted.

Fixed file has been sent to you by email.