Masking content and dynamic text boxes

so i have a problem…

i am loading external swf files into a masked content blank movie. it all seems to work fine except when the external swf file also contains a dynamic text box which loads text from an external text file. the swf works on its own, but when its loaded into the masked content on the main movie the text dosent show up. when i take out the mask on the main movie the text shows up just fine but now its unmasked. completely puzzled.