I heard from another player that Ranger's mass camou is not stacking anymore with the 1st lvl camouflage spell, yet it's not shown in the modified spells topics.
I found a changelog from 2008 stating that it does not stack.
May I have a confirmation?
(On the side-note, if the above is true, then there's no useful 4th level ranger spells gained at level 15(!!) - summons and polymorf are nerfed, Freedom of Movement has a longer duration in potion form, cure serious wounds is very weak once a rangers is at lvl 15 with 150 hp - and this makes me very sad
)