This also happens if unraid is busy doing something else (but if you can bounce around from tab to tab it'll be fine) and sometimes if you have another log window open from a previous session and then rebooted unraid.  This include docker logs etc)

I still have this issue and it is not blockers or anything.  It also is not the server waiting to do something as it is mostly idle.  As he also mentioned, as I did, if you run it manually it comes right up.  It will not however show up where it should inside that window that it opens. There is a bug somewhere.

Does it happen if you boot in SAFE mode?

Safe mode?  Never knew their was one.  I guess I am kind of glad I did not know that.

Same issue with docker logs, running the command manually in shell works.  These issues are not show stoppers but annoying if you just want to see at a quick glance what's going on rather than logging in and delving into command line.

Makes no sense but the logs are now displaying.

What change did you make if any?

Not a thing which is puzzling.