I have been having a very similar problem, I installed lspdfr the other day and a few vehicle mods, and the game worked fine. Today I installed a few more vehicles and some plugins such as stop the ped, compulite, grammar police, ultimate back up, bait car, and prowler radar. After installing these mods I go to play the game, first it boots up with the splash screen but with no mention of lspdfr, then in game there is no lspdfr tab on the pause screen as well as no ability to walk into the police station and be a cop. The vehicles I installed did work. And some of my non lspd plugins work such as the trainer. I had some trouble with the plugins folder with things not being recognized when dragging and dropping and somethings ended up in the wrong spot, I went back and moved things around and maybe this is what messed it up, lspdfr folder contains the .dll files, lspd configurator etc. and it is in my gtav folder, my LSPDFR folder is in my plugins folder and contains all of my newly installed plugins. Debating on reinstalling lspdfr after I already reinstalled the rage hook. Just seeing if theres anything I can do to avoid that headache or if there is any advice on reinstalling to not screw anything up, thanks.