Something changed in the last couple of days that causes a bunch of API calls to fail when grabbing image dimensions.

This error is consistently generated from the URL below:

{"servedby":"mw72","error":{"code":"internal_api_error_MWException","info":"Exception Caught: Internal error in ApiResult::setElement: Attempting to add element imagerepository=shared, existing value is shared","*":""}}

http://en.wikipedia.org/w/api.php?titles=File:Convento_Cristo_Decemebr_2008-18.jpg|File:Convento_Cristo_Decemebr_2008-8.jpg&prop=imageinfo&iiprop=dimensions&action=query&format=json

Requesting the data separately, i.e.

http://en.wikipedia.org/w/api.php?titles=File:Convento_Cristo_Decemebr_2008-18.jpg&prop=imageinfo&iiprop=dimensions&action=query&format=json

and

http://en.wikipedia.org/w/api.php?titles=File:Convento_Cristo_Decemebr_2008-8.jpg&prop=imageinfo&iiprop=dimensions&action=query&format=json

give the correct result.

Other multi-queries like

http://en.wikipedia.org/w/api.php?titles=File:Convento_Cristo_Decemebr_2008-18.jpg|File:ConventSanDiegoMexicoCity.JPG|File:Conventional-lathe.jpg|File:Conventioneersposter.jpg|File:Convento_de_Cuilapan.jpg|File:Convento_Arr%C3%A1bida.JPG&prop=imageinfo&iiprop=dimensions&action=query&format=json

also consistently work fine.

What's going on here?

Thanks,

Eric