I am having a similar problem with 5.0. I restored an application (SE Local) and all of the text in one of the displays (which was simple fixed text in push button objects) has been changed to "?". When I try to open other displays, FTView shuts down immediately.
I also found out that I have to reboot my PC just to delete an application, before I could try again to restore it.
Now, I am getting errors with the Factory Talk directory.
I am going to uninstall Factory Talk Services Platform, and FTView Studio and start all over with a fresh install. This is the sorriest software I have ever struggled to use...very very frustrating...