hi, bought the addon today. very nice overall, except this exact issue that i have too.
it happens only with MU2 and LR's R22 heli, for some reason. all other planes are fine.
cpu: ryzen 1600x
gpu: amd rx580 (8 gib)
main memory: 32 gib
os: win 10 64-bit
zinc: on
photo attached. zoom in and youll see squares for droplets.