I inherited a 1265 line project that I believe was created in Project 2007 several years ago (~2013). It is now in Project 2010 and has had several different people working on it, along with periods of complete neglect.
There seems to be some funky things going on, for instance if I select the Critical Tasks check box in the Gantt Chart format tab I get an error stating "The argument value is not valid. Verify that the value is spelled correctly, and that it is of the type that this argument expects." I have also found that a lot of the tasks have a leading and trailing space when I go to edit the task name. I think this may be an artifact from copy and paste or maybe converting from Proj2007. Another thing is that after meeting with stakeholders and updating durations and predecessors, Finish dates will appear to be inline with the project teams expectations. I save and check in to SharePoint, when I re-open, the Finish dates have changed. A lot of Resources are overallocated since Project is only being used to manage tasks and durations. And when Project asks if I want to assign more resources or reschedule, I tell it no and leave the resources overallocated. Might Project be changing durations, start/finish dates in the back ground?
So, with that my primary question is do you think it will be easier to fix the problems or start over with a fresh Project 2010 schedule.