Using custom phrasegroups in a plugin in VB4?

[BirdOPrey5]

Been searching for this answer for a while... Quite a few old threads about this but from the VB 3.5 and 3.6 days...

Apparently you used to just add this code to init_startup hook:

$phrasegroups[] = 'groupname';

but it's not working for me ON VB 4.1.11.

I can use the phrasegroup on a custom php page by having this code near the top:

$phrasegroups = array('groupname');

Which is basically just another way of writing the same code as above- that works fine.

However neither works on init_startup.

Any ideas on this?