I figured I'd share what worked for me in case someone else has the same issue, googles it, finds one of these threads, sees that it's been resolved, but also is frustrated that the fix was never shared...
1) Go to your GTA V directory
2) Right click on "GTA5.exe"
3) Click on the Compatibility tab
4) Make sure "Run this program as an administrator" is OFF/UNCHECKED
5) Repeat steps 2-4 for the "GTAVLauncher.exe" file
Viola and you're welcome, stranger who googled this like me and couldn't find the solution.