cannot see shadow under markers

I'm not seeing any shadow, nor in node locations nor in my gmap view. I'm using a custom set of markers but in any case i cannot seed shadows; my custom set is named "ispro" and in placed under modules/gmap/markers/ispro with this ispo.ini, see attached files for screenshots where markers are normally shown but not shadows... someone can solve this ?

; Defaults
[defaults]
shadow = "shadow.png"
anchorX = 14
anchorY = 51
infoX = 24
infoY = 4

; Marker sets
[ispro generic]
name = "generic"
sequence = "generic.png"
[ispro porto]
name = "porto"
sequence = "white_porto.png"
[ispro vvf]
name = "vvf"
sequence = "white_vvf.png"
[ispro asl]
name = "asl"
sequence = "white_asl.png"
[ispro cri]
name = "cri"
sequence = "white_cri.png"
[ispro dpc]
name = "dpc"
sequence = "white_dpc.png"
[ispro fa]
name = "fa"
sequence = "white_fa.png"
[ispro pc]
name = "pc"
sequence = "white_pc.png"

; Files