Open an STL file in 123D Design?

I recently discovered that I cannot open an STL file I downloaded from Thingiverse within 123D Design. Is the file format no longer supported? I was able to open the file and manipulate the object with the old 123D beta 9. I tried opening the STL file using the 123d beta on another computer and then saving it as a 123d file. When I tried to open the 123d file with 123D Design, it crashed the application.
I am using 64 bit 123D Design for PC, with 6d bit Windows 7.
Any ideas for how I can use STL files in 123D Design?
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