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Just a shot in the dark here - but having played with the xsl in the md plugin (running it by hand) I noticed that it needs to load resources from the network.

Code:
<xsl:stylesheet
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
        xmlns:oo="http://www.omnigroup.com/namespace/OmniOutliner/v3"
        xmlns="http://www.w3.org/1999/xhtml"
I work behind a firewall and had forgotten to set up my proxies that day and it hung on me too (when driving it from the command line directly) until I resolved the issue.

It might be that if you export without an active/correct network connection that it hangs.