In their Fuji X10 test, when shooting at bright lights, Dpreview found "white discs" surrounding the light source that are caused by sensor blooming. Fujifilm promised a firmware update that will "lessen the effects of blooming":
"Fujifilm engineers have examined a number of sample shots and have concluded that the camera is working within prescribed tolerances. The blooming issue is something not uncommon to many types of digital camera. It is possible to reduce the effects of blooming either by increasing the ISO or widening the dynamic range on the camera.
However, after receiving a number of comments from users, we can understand their concern and plan a firmware upgrade to lessen the effects of blooming. We will announce in due course when the upgrade will be available."