Canon has released another firmware update that addresses an iris issue while shooting video in manual mode. It also corrects some misspellings in the Spanish and Thai menus. This iris issue seems to be more prevalent with macro lenses. Here is a rip from the Canon US website.
1. Fixes a phenomenon in which the set aperture moves when shooting movies
4. Corrects misspellings in the Spanish and Thai menus for applicable products.
in manual exposure mode using some lenses (such as macro lenses).
2. Fixes the AF point-selection behavior of the C.Fn III-7 (Manual AF pt.
selec. pattern) custom function when set to .
3. Fixes the AF point display for the viewfinder electronic level when
shooting in the vertical position.