Clipping mask ignored on export
I have a simple logo with a clipping mask. It looks perfect in Illustrator, but when I export it as a PNG, the clipping mask isn't working. Here's what I see in Illustrator:

And here's what is exported:

Tried to upload my .ai file but the forum says "the content type (application/postscript) does not match its file extension and has been remove". Not sure what that's about.
Any ideas?