Never mind .. it's sorted itself out now :P
As an aside .. when I came to reply to this post, as per usual it had logged me out (I can't remain logged in to both these forums, and my own site, so constantly switching ... *hint hint*) .. and I got this weird message:
It's obviously a rogue, the only person who can, cos you can't see him!
I downloaded and installed the most recent version of the addon yesterday (it states on the addon in-game 8.0 but I think it's 8.0.2) .. and it did track most bosses that we did .. however it failed to pick up MOTHER.
I've got a copy of the Yells that happened around that time, but I'm not sure which, if any, is classed as the death yell:
21:13:21 MOTHER yells: System restored. Levels returned to secure thresholds.
21:13:34 MOTHER yells: Facility systems compromised. Proceed with caution.
21:13:39 Princess Talanji yells: What is dis place?
21:13:52 Princess Talanji yells: You have been keeping dat abomination alive?! Why?
21:14:08 Princess Talanji yells: And have you found de answer?
21:14:24 Princess Talanji yells: We do not have dat kind of time! G'huun must be stopped now!
21:14:48 Princess Talanji yells: We have a plan. Activate de consoles and put an end to G'huun's plague once and for all.
21:20:22 Princess Talanji yells: What is dis creature?! It appears as if it were once a loa.
21:20:28 MOTHER yells: Observation accurate. This facility has run numerous experiments on loa to research solutions for Old God corruption.
21:20:38 MOTHER yells: Tests focused on the ability of G'huun's corruption to reanimate expired tissue. Results were inconclusive and specimens were destroyed.
21:20:49 Princess Talanji yells: You seem to have missed one.
I suspect it may be the first one.