Grass Valley have released a small patch for EDIUS 10.34, which, if you EDIUS is not prompting you to download you can get by just popping up to the help menu and choosing “check for updates”. This update just fixes a couple of small bugs. You can see the list and download the update here: https://www.ediusworld.com/DownloadsForEdiusX.html…
One of the bugs fixed is that MP4 quality was apparently very low if the average bit rate of an MP4 was a lot lower than the max bit rate. It does not say how much lower but mainly if you think your MP4s have been looking a bit naff recently then try this update.
I assume this is a pretty new update as it is not mentioned on the forums yet and I only found it was out by checking the aforementioned item on the help menu.