While most reactions to the Fujifilm X-T1 have been extremely positive, it seems that some early produced models of the camera have a little problem with light leakage.
When the connector cover, used for the HDMI, mini jack and other ports, is open and strong light is shone into it at a certain angle, this light can be reflected within the camera, appearing on the LCD and on recorded images.
As the effect 'generally' (Fujifilm's word) only occurs when the connector cover is open, most users will never experience it. It is also only applicable to early produced X-T1 cameras - Fujifilm says that recently produced X-T1s have already been modified.
The problem was first discovered by a user of Fuji's X-forum, who posted a short video demonstrating the flare effect:
For current owners of X-T1s, if your camera has a serial number lower than 41M07801 then you are advised to contact Fujifilm UK's camera service centre on 0844 553 2322.
Fujifilm will inspect your camera and make any adjustments deemed necessary to correct the issue.
(Via Fujifilm UK)