I confirm the error. The same form me. Exactly the same. However, inspecting the code of the referred file, it seems to be OK.
Can you guys check it out? Since I have several sites it seems the problem will start to cascade on all of them, since every metabox plugin is set to auto update!
Thank you!
EDIT: OH, just saw the last comma on the line #53!
Removing it fix the problem indeed.