Fujifilm is known for releasing firmware updates based on popular feedback from their customers. Typically this firmware may have small bugs, but their most recent major release version 4.0 failed miserably.
On May 8, Fujifilm released firmware version 4.0 for the X-Series cameras. This release brought new life to my X-T2, bringing features that the new X-H1 body has, such as video F-Log and 120 frames per second shooting rate.
The issues surrounding version 4.0 include converting raw files, screen flickering, and the camera locking up while in use. Unfortunately, I just happened to update to 4.0 over the weekend, and yesterday while shooting video and capturing stills I noticed flickering on both the LCD and the EVF. The flickering also could be seen in the recorded video as well. In the image below you can see the black bar running across the LCD.
Thankfully Fujifilm has confirmed there are issues with version 4.0 and have already included a version 4.01 for users to upgrade to. It appears the patch is nothing more than the stable version 3 of the firmware. Unfortunately users with X-T2 cameras will have to wait a little longer for additional functionality via firmware from Fujifilm. Firmware version 4.01 can be found here.