FullHD, 4K ... footage from a lot of camcorders (Sony FS100, Sony NEX A6300, Xiaomi Yi, Mavic Air ...) No matter the source of the footage.

I found that It happens only when the Project media window is larger.

Please look on the video bellow, when the Project media window is small, no problem, after window size changed to larger, it start refreshing.

Interessting. So it happens if the Project media Windows is made larger - here above 42 thumbnails. Will test that on my 8 core System.

Beside that - your know that for UHD/4K footage they have specified an 8-core System? And some of the codecs you use are harder to decode as other codecs, what may make the situation not easier. But beside that, it should not happen for sure.

I see the same, but there are different real issues.
When is the 2nd update coming from which one of the Vegas team told us comes with some fixes?

I have reported this issue already earlier. In my system when more than 100 sthumbnails are visible in the window I have the same effect in media manager and storyboard.It happens with XAVC-S UHD, m2ts FHD and DV media.

I'm seeing this in VEGAS Pro 16 Update 2 (build 307). When more than 49 thumbnails are showing in the Project Media window, thumbnails unnecessarily refresh themselves when the mouse is hovered over the window.

Tested with DV and GH4 UHD.

Support request: [Ticket#2018102717002258]