I believe this is a known issue since around version 4.6. Someone correct me if I'm wrong. The solution is to simply put the path of the script as well, which as you've noticed, works fine.

I know it adds a level of work to change everyone's login script field in AD. But it's not as hard as you might think, since I think you can select more than one user at a time and edit the field for all at once.

See the following post where the same issue was discussed.

http://www.kixtart.org/forums/ubbthreads.php?ubb=showflat&Board=1&Number=210505

Edited by ShaneEP (2016-05-19 03:06 PM)