I have just pushed out 0.8.2 of the plugin.
This modifies the bundled pycomicvine to use the library json module rather than the external simplejson.
I was concerned that the version of dateutil bundled with calibre would be too old (latest version has 1.5), as the setup.py file for pycomicvine lists 2.0.0 as required; however I have run some tests using 1.5 and it seems to be fine, so looks like fixing this was a simple one-line patch
