In 1.1 when you leave the animations ([Begin action]) without transparency, you can do it from the code of specifications ([bg 0]).
Example.
Work fine in 1.1.
[BG FIRE]
type = anim
actionno = 2
layerno = 0
start = -990, 490
delta = 1.30, 1.40
mask = 1
trans = addalpha ;add or sub
alpha = 256,256
[Begin Action 2]
60,0, 0,0, 1, ,
60,1, 0,0, 1, ,
60,2, 0,0, 1, ,
60,3, 0,0, 1, ,
60,4, 0,0, 1, ,
60,5, 0,0, 1, ,
60,6, 0,0, 1, ,
60,7, 0,0, 1, ,
Work fine in 1.1 and 1.0.
[BG FIRE]
type = anim
actionno = 2
layerno = 0
start = -990, 490
delta = 1.30, 1.40
mask = 1
trans = addalpha
alpha = 256,256
[Begin Action 2]
60,0, 0,0, 1, , A
60,1, 0,0, 1, , A
60,2, 0,0, 1, , A
60,3, 0,0, 1, , A
60,4, 0,0, 1, , A
60,5, 0,0, 1, , A
60,6, 0,0, 1, , A
60,7, 0,0, 1, , A
There is no problem with the static sprites with transparency and that is why before upgrading the stages clean this and I did not realize that I generated this in 1.0, the original version in my pc is not without that blurred (60,15, 0,0, 1, , A) and only replace the def.