Tried an mkv from NYAA: no go, format not supported (loads to 100% but then gives the error) Different mkv from Kickass: format not supported (without loading,

Tried an mkv from NYAA: no go, format not supported (loads to 100% but then gives the error) Different mkv from Kickass: format not supported (without loading, apparently, though I wonder if it's cached given that it was Guardians of the Galaxy) TV episode of Gotham: same as for previous Something is happening because it says e.g. 'Gotham' in the top and retrieves a nice faded background of the cast but I keep getting 'format not supported' EDIT: seems to be my browser or connection; trying a different machine on a different IP and it works very nicely and quickly indeed.