Slow loading / Errors late

[mik_s]

There was nothing being played when the logs were in trace mode so it does not show anything. There was some things in the prev logs before it was put into trace that may be related but there is not enough info there. Could you recreate the logs, see the section in red above.

One thing I did notice is you have the Cannot invoke "com.google.gson.JsonElement.isJsonObject()" because "element" is null error too and I found a way to temporarily fix this here until the next release that has this patched.

This may also be causing the problems you have been having so try that fix first then do new logs if it doesn't fix it.

[mik_s]

The bit I was referring to was to fix that "element" is null error

You can fix this by unchecking "Enable external network" at the bottom of the general settings tab in the old GUI or set external_network =false in UMS.conf
(I had to edit the conf as it did not save the setting for me)
Once UMS is running you can turn this back on. It only appears to happen when UMS is initializing.

and ProgramData is a special hidden folder so you might have show hidden if you do not see it. That bit was a reply to another user though.

Try that fix and do some more logs with a video trying to play and I'll see what is causing it if it is something else.