Can't Save File

I am using UE 4.4.3 on Mac OS X 10.9.5, while trying to save a UMG.UserWidget I am prevented and receive the following message:

The asset ‘/Game/Blueprints/Widget’ (Widget.uasset) failed to save.

Cancel: Stop saving all assets and return to the editor.
Retry: Attempt to save the asset again.
Continue: Skip saving this asset only.

I guess it’s a bug, if anyone has found anything similar and/or knows a fix I would appreciate it!

When I try to delete the .uasset file in finder it tells me the file is in use. This is after I have just restarted the machine.

I was able to duplicate the file and use the duplicate without and issue. I still haven’t been able to delete the original though.

Looks like someone or something was accessing the files from the shared drive the project was on! I had no issues after creating a local copy.