My guess here is that we don't support the particular path syntax.
It might be a syntax error as well, but that's easy to rule out.
Just place them in a regular SVG document to see if they show up.
Internally this is handled through the Path.parse method
There's a snippet in the docs that demonstrates how it works on a sample path definition.
You can run it in the Dojo by clicking the "Edit this example"
Can you send us a sample in the Dojo with the paths that fail to parse?
Join us on our journey to create the world's most complete HTML 5 UI Framework - download Kendo UI