Also you may have a look into the MS Project Organizer, if you see something strange there. The organizer you can also use to copy content from one file to another.  After option 2 and 3 you can check, if the problem still exists. This way you find out, if the global template is possibly corrupt or if the project file has a problem. In this case, you need a Microsoft Project service for online repair. I hope you can fix file on this service.  onlinefilerepair.com/.../project-repair-online.html 
[IMAGE] [IMAGE] Hi, I am having a really strange issue, basically, since Thursday 2 users are struggling to open a project document correctly but one user is able to open the document correctly and use it fine. They are all running the same versions of office and patched equally. I have tried uninstalling, ccleaning and reinstalling project on one of the faulty machines but still having no luck at all. It is a really difficult situation to explain but basically the drop-down options aren't working for one column. Now it wouldn't be a problem to recreate the options, we tried this but after closing and opening the document a couple more times the problem returned on 2 of the 3 machines that use the file. I have tried restoring a couple of versions of the document, one from Thursday when it was working and also I tried as a test restoring the oldest version of the document in shadow copy but they both had the same problem. If anyone could help it would be most appreciated. I have also attached 2 screenshots to try and explain the situation a bit better. Best regards!
Microsoft Project 2010 no longer opens the file