For me, at least, this has never worked but does now. Great!
[log in to unmask] just now got a warning about disk 300. Here is the
line from my local sysvars that just started working.
...
* MDISK.cuu = 'acc rw ro nl th1 th2 / wlist / wmsg'
MDISK.300 = '* N W W 95 100 / [log in to unmask] / Public Notebooks'
...