"Fatal Error Databse is locked" when importing package

Using Unity 3.3.0f4 on Mac mini, with project is opened from a Windows share, I'm trying to import a package. Unity writes "Decompressing package" and the crashes with the pop-up message "Fatal Error, Database is locked". I can try some things, like moving the entire project to a local folder, but i would like to understand if i can still work from my mirror-raid hard drive on my windows file server instead of from the local mac hard drive that isn't backed up properly