From what I can tell, something has bugged out User Interfaces. I have this issue with F4 for LSPDFR and with the UI for Finkone's Police Radio. My workaround for the time being is to install a trainer so I can teleport or fix my vehicle since thats mainly what I use the F4 for.
Another wonderful tip before everyone says it's necessary for loading plugins:
Add any plugins you have (Police Radio,SpeedRadar,Etc.) to the "startup.rphs" file.
This file opens in notepad and all you have to do is start a new line and type LoadPlugin NameofPlugin.dll and then save the document. Also, if a plugin comes with the "startup.rphs" file, DO NOT replace the original one with it. This may lead to issues loading LSPDFR if you overwrite the file since this file is what RageHook references when it loads plugins.
For a detailed look on how to do this, Jeff Favignano released a wonderful how to on his youtube channel about installing mods (sorry I suck at linking things so you'll just have to find it unless someone else would like to link it here).
Hope this at least gets some of you going again.