Yes it is a Vault project... I can check stuff in and out and I can even keep it checked out if I want that option. I can do it if I use the Vault Explorer, just not with the INV Add in. The really funny thing is the last user I set up this afternoon; her machine works fine and does it all the time. So what causes you not to be able to do the delete?
I do Implementations for a living and it has talked two days to clean up this Vault. I thought I had it fixed yesterday and did not have this problem. I came in this morning and they had used the old Project file and it took me a half day to get it fixed. Now everyone is on the new project file and checking things in and out of Vault. I just cannot get it to delete the working copies....