Thanks for your post.

This bug has been added to the tracker:
https://winscp.net/tracker/872

The updates to the visuals in the file explorer between 4.3.6 and 4.3.7 have removed a feature that I have gotten used to - greying out hidden folders (folders beginning with .). Having them all black now and looking the same as more important folders is very distracting. I will be reverting to the old version, unless this is just now a non-default option that I wasn't able to find. I actually had to do a complete uninstall (at least clearing the registry entries), otherwise trying to revert from 4.3.7 (or 5.0.7 beta) to an older version still kept everything non-grey.