Hi,
We already have this reported in our system. We don't have a ASUSTOR to replicate the case 1 to 1, but may I ask you to try the following:
• Create another network accessible drive (e.g. one of the computers if that is the case), and store some of the textures there
• Try locating these textures just like you did before (load into CoronaBitmap), see if everything is fine with the new network.
This way we will narrow down the issue and understand if it has something to do with the actual NAS (model, system etc.) or not.
Just in case, make sure you run 3ds Max with admin rights too.