Update: This post is out of date. Please see The “last word” on the Insane in the Membrane hotfix for the latest information.
Today I was able to confirm that Insane in the Membrane no longer requires that all reputations be held simultaneously, a change that was introduced in Patch 5.0.4 and widely regarded to be a bug. As a result, I’ve restored the relevant information to my guides.
However, there are still some gotchas, especially if you were in the middle of a grind.
At some point between Patch 5.1 and 5.2, Blizzard seems to have fixed the achievement so that, as it always did, it no longer requires reputations to be held simultaneously. Players who began the grind during Patch 5.1 and completed it during Patch 5.2 were able to do so without keeping the Bloodsail Buccaneers reputation.
Prior to this fix, prior to and during Patch 5.1 specialist GMs were occasionally granting the feat to people who would otherwise have gotten it. This practice ended by Patch 5.2 and GMs will no longer award the feat, since it should be fixed.
The catch is that if you gained reputation with a faction and then lost it again before the fix, the achievement tracker will have no record that you ever gained the reputation to begin with. You will know if you are affected by this when you run the command
/run AddTrackedAchievement(2336) and see criteria marked as incomplete that you actually completed earlier. In this case you are screwed; GMs will not give you partial credit, and since the issue is “fixed,” will no longer award the feat. You’ll have no choice but to grind it again. This is really going to suck for my Insane #5, who is in exactly this situation; I’m looking at a good 20 hours of grinding just for Bloodsail now.
Overall though, this fix is going to be welcome news to most people going for Insane in the Membrane.