Hi thanulee,
Thanks for the screen capture, very helpful!
This would be a question for the Octane forum.
https://render.otoy.com/forum/viewforum.php?f=30
or their support. Sorry to re-direct you here.
Fingers crossed it will be solved for you.
.
Since I do not have a full running Octane environment here (of course I wish Macs would be included), I see that you need to have at least one Tag already active to select those, as your clip shows, nine Tags are recognized in the Attribute Manager. This is since a while the behavior of this plug in, as I can confirm this for R17 even (it doesn’t need the hard ware [GPU] to work at least in the interface).
My suggestions, use the Selection> Selection Filter> Create Selection Object. You will notice that the Selection Object will fail to store only Tags initially. So select at least one Object while creating the Selection Object, then delete that Object out of the List. The selection of all Tags populating that Selection Object will be “re-selected” with that option, and if named properly, it will work with many other Selection Objects.
In case you have never used the Selection Object, Select the Selection Object, and in the Attribut Manager> Object> [button] Restore Selection. IF you ahve many Tags, and if you even have the need to change always a specific group of those, or all, this is the way to go.
Cheers