Thanks for the comment
Please try this out:
(Birds.esp has no conflict with the others, but just to be sure. )
(GreenWaterFix_Compatible.esp is the one of main file. )
I think your load order has no problem.
I installed both "W.A.T.E.R v1.71"(the latest one) and "Birds and Flocks v2.4" with my mod, and confirmed that it's OK.
My confirmation is:
When the game crashes immediately on Bethesda logo, there must be a lack of master files.
All esp/esm of mods have Skyrim.esm as master file.
"Birds and Flocks" has only Skyrim.esm as master file.
W.A.T.E.R v1.71 also has update.esm as master file, so do my "GreenWaterFix" files.
(Update.esm is seriously related with underwater problem.)
As for my "GreenWaterFix" files, only "GreenWaterFix_v2withDawnguard" has an additional master file (Dawnguard.esm) .
Edited by AltheaR, 08 July 2013 - 05:57 AM.