Pois spell not visible

[Skeletoria]

Hi all....new on forum so excuse me if i misplaced this thread...
Following problem--> since 1.65 patch the poison spell of my druid (yellow one to be exact) doesn't have a visible affect anny more...The mob is dmged like normal but I dont see the yellow cloud anny more uke:
Only mob it had visible affect on was an enthralled silvier and when i tried it on one of those again...it wasnt visible annymore
Plz help me with verry annoying problem

 

[Ctuchik]

tell GOA

 

[Blondy]

possibly gfx drivers or just a bug !