Curious, works fine for me even with 2185 and higher. And there does not seem to be any change that could affect this.
Can you re-test (to re-install 2186) and check for existence of the /scripts/showAllNodes/ folder in the MM5 install folder after installation? It should be preserved and working.

actually no. However, if that is required, I would like to understand why it wasn't needed before. Build 2181 did not have this problem. And fwiw, as a test, I upgraded an existing portable 2181 installation to 2185 and guess what, all subnode information can be displayed, meaning for 'albums' and 'album artists' you have the right arrows that allow to unfold either albums or artists. Unlike the 2185 fresh portable install, which does not show them.

Did you tried to reinstall showAllNodes script ?

this is for build 2185, portable install into a fresh directory (not 'updating' a previous portable installation)
problem: under the main node 'music', in the left tree, I enabled the subnodes 'albums' and 'album artists'. Neither of them shows the right arrow to now open the list of albums or album artists for quick scroll. This worked fine with the last build.
(unfortunately I have no webserver available to add a screenshot)