Thanks for the reply.
Having tested a few more things this morning I can confirm the HUD is working fine on Snap tables but there is one circumstance where it is consistently failing to show up, which is worth noting for anyone reading.
It all comes down to multi-tabling the same stake of Snap and the speed at which you open your tables. If you try and open 2 or 3 tables in very quick succession (as many players would do at the start of a session), the HUD will not appear on any of those tables. If you stagger the opening of those tables (ideally play a couple of hands before adding each successive table), all works fine. For me at least, this is not a one off thing and I can consistently reproduce this problem of the HUD failing to show when quickly opening multiple tables.
I'm probably not the only one who has found this issue so figured it was worth mentioning