I upgraded to 5.4 (Github Release) and these errors appear when starting the editor.
I have the editor set to startup on an empty level.
I switched all cloth simulations to the new Chaos Cloth plugins.
Chaos cloth is working fine and the errors don’t seem to affect anything (that I know of, but 5.4 crashes sometimes and previous versions did not).
The screenshot below shows the Chaos errors.
The green dashes in the screenshot are what I’m talking about (I also have a warning about MDL SDK).