I just checked the permissions and there is a difference between local files and those on the server, which is to be expected:
What is strange is, that those permissions work fine with literally all other software. It is only Rhino that is by now basically unusable with files on the file server, even though that was never the case before. Since our file server hard and software has not been updated at all for several years (don’t fix, what ain’t broke) it must have been a change in Rhino causing this.
The dates on the files are all correct.