With the release of unraid 6.10-rc2 I took a leap and upgraded my server and was able to determine the issue. It seems with 6.10 there are a bunch of dependancies that have been removed from unraid as they aren't used. I've mentioned this in the unraid 6.10-rc3 forum post and it seems a further conversation is really needed around plugin dependency management. I'll bump this again with them to see how I/we can go about fixing this without me just added all these additional system libraries to this plugin. For now on my system I am utilizing the User Scripts plugin to execute the following script when the system starts up, which then gets the images working again.
The other thing I can do, is look into is parsing the text data that is available and creating my own images instead of vnstati, or just provide the table output.
Anyways, here is the script:
upgradepkg --install-new gd-2.2.1-x86_64-1.txz
upgradepkg --install-new fontconfig-2.11.1-x86_64-2.txz
upgradepkg --install-new harfbuzz-1.2.7-x86_64-1.txz
upgradepkg --install-new freetype-2.6.3-x86_64-3_slack14.2.txz
upgradepkg --install-new libXpm-3.5.11-x86_64-2.txz
upgradepkg --install-new libX11-1.6.3-x86_64-2.txz
upgradepkg --install-new libxcb-1.11.1-x86_64-1.txz
upgradepkg --install-new libXau-1.0.8-x86_64-2.txz