Dynamic html text under mask can't show?

I set my html var with

var_title = “<p align=‘left’><font face=‘Verdana’ size=‘9’ color=’#D9D9D9’><b>”+title_external+"</b></font></p>"

The filed var_title is BItmap Text NO anti-alias, embeded.

This var is in a clip, and this clip is under mask, while title_external is a var load form PHP.
why it does not visualize the text?

Please help me.