This is a bit of a weird one - Alertness' bonus to Perception stops working with multiple sources loaded that use PRECAMPAIGN (see attached pcg - this e.g. uses Core, APG & Super Genius Games' Adventurers Handbook).
This seems to be fixed if the PRECAMPAIGN lines are commented out of sggah.pcc, but that of course stops that source working as intended and I can't see any problem that might interact with Perception/Alertness in the relevant .lsts.
Found another symptom of the problem at the linked bug.
Not with 30 mins of mucking about... have you got a brilliant idea?
In particular all of the following work fine, despite including a similar |PRECAMPAIGN:1,INCLUDES=<source> construct:
UC + UM
ACG + ARG
ISWG + Bestiary
ISWG + Champions of Corruption
Occult Adventures + Arcane Anthology
So it seems to be unique to this source (SGGAH) with any of its (functional) PRECAMPAIGN lines (i.e. SGGAH works fine with only Core).
More weirdness. If I remove the |PRECAMPAIGN:1,Advanced Player's Guide lines and just make the source dependent on the APG, the problem goes away.
I'm going to go ahead and commit this as a fix; a slightly unnecessary dependency on the APG is hardly a hardship.
Darn, this fix is not a "stable" fix - it now works sometimes and doesn't work sometimes - suggest this isn't incorporated into master.
Afraid I'm not sure how to "withdraw" the PR ... nor do I seem able to unwind the bug status back from PR submitted
I'm unable to follow if this is code or data?
No further reports of this bug. All attempts to reproduce are unsuccessful. Closing.