GtaLove

Rage developers as well as ScriptHookV developers are actively working on updating their programs to work with the latest updates.
 
Bare in mind they have a lot of work to do as they don't want to just rush a fix, and then everyone is flipping out that the new RPH is crashing all the time. Did you by chance backup your last game before Rockstar issued the update?
 
 

If you used the backup tool within RagePluginHook it should automatically revert you to the previous version of the game which is .944 and enabling you to play. Always backup, always, lol.

I usually have 3 copies of the game myself. 1 Vanilla copy with nothing but the stock files, 1 with the most recently stable (for me) copy with all mods and 1 with the latest updates for everything.
 

I have an issue:
 
I backed up 'critical' files with Rage Plugin Hook prior to the 1011 update. When I used RPH to revert to the 944 files that I backed up, GTA V wouldn't launch. And I haven't been able to play since it updated yesterday.

You'll need to remove the patchday14ng and mpspecialraces folders in the 'updates' folder if reverting didn't do it for you. Once everything (RPH, ScriptHook etc) are updated if you're using steam just verify the game cache and it'll redownload the 2 missing update files. 
 
Should fix your problem.

I tried that at LEAST 5 times, and no result.

Yes, now RageHook and ScriptHookV are updated to the new 1011 patch, so it works now.

They updated ragehook so you don't have to worry.