I recently got back into LSPDFR after a year of absence. So after doing my usual copying of a clean GTA V directory. I installed LSPDFR, ScriptHook, and the latest version of RageHookV. It kept on crashing for some reason so I dug back into the LSPDFR Forums to try and find a solution. Managed to find one by user Jethro McCain.
[I know that this doesn't really go here, but the RageHook Forums seem to be nonexistent.]
First, go to wherever you have your modded GTA V installed and locate the GTA5 application.
You want to right-click, go down to the bottom of the menu and left-click on properties.
Click on Compatibility. Go down and check "Disable Fullscreen Optimizations". Finally click "Apply".
I have no idea why this worked for me but it did. I would like to thank Mr. Jethro McCain for finding this fix. I just wanted to put this as it's own post so that others can see it and hopefully enjoy LSPDFR again.