Opening second file from server error

An error occurs when i try to open a second file in Draftsight. We works with a file server and the attached images error appears when i open the second file. If u try to open from File>Open dialog window freezes and the tree don't recognize some folders and ubications. The files opens correctly from local device. 

Any suggestions? Thanks

Image 1: Error: Cannot find the drawing [server path]

Image 2: Location not available [server path]