This is a known issue in the CMIS Connector and SharePoint 2010. If an Office document title contains text that's enclosed in angle brackets, the CMIS Atom Publishing Protocol (AtomPub) binding does not generate a well-formed XML document response. For example, this issue occurs if the title text resembles the following:
"Project <project> Report"
CMIS clients can't parse responses that are not well-formed. When a document title isn't encoded as an XML literal, an XML parser interprets the Office document title as an unclosed XML tag, and the parser does not parse the AtomPub response.