mc blinking erratically when using 2 masks;

[dsdsdsdsd]

hello;


I have on a timeline:

mc_mask_A
mc_A


with timeline code:

mc_A .cacheAsBitmap = true ;
mc_mask_A.cacheAsBitmap = true ;
mc_A .mask = mc_mask_A ;


inside of mc_A I have

layer 1 set to mask with a shape;
layer 2 with mc_B that has an imported .avi;



the combination of these 2 masks is causing the mc_B ( which is effectively being masked by 2 masks ) to blink erratically;

I understand that others are having this problem also;


any thoughts?


thanks,
Shannon