[web2py] bug with multi-form input component

[weheh]

I have a multi-table multi-form input that I've componentized. As a
stand-alone component, it's various sub-forms workthe fine. But when I
load the component into the rest of the app, it fails to upload a file
in one of the sub-forms. It gives the standard "enter a valid
filename" error, as if there were no file. I traced it thru eclipse
and the sub-form vars are empty after submit. I could be doing
something stupid, but it seems like a bug.