Here's a list what you must do which problem you've got
Cannot install/run Libra
Please make sure that you have added an exception for Libra in your anti-virus & firewall and make sure that you are running it as an Administrator account.
Black screens
You must go to you're autoexec.cfg or config.cfg and must change the follow variables to the right one:
//Anti-Alaising
- mat_aaquality "0" --> 2
- mat_antialias "2" --> 0
Freezing players / Libra lags
You must set Libra on a seperate CPU, I prefer you're last cpu and set Affinity in Task Manager and disabling Anti-Alaising seems to solve the issue.
//Anti-Alaising
- mat_aaquality "0" --> 2
- mat_antialias "2" --> 0
Errors with counters
Just reinstall Libra.
Can't open Libra / Can't login
You're sure about it that UAC is off? If it's off and still not working just reinstall Libra.How to shutdown UAC
Invalid integer
Nothing to be afraid of it. It's just a fault inside Libra. The only fix is to wait or to reinstall Libra.
Other things
Just be sure that your antivirus AND firewall have the settings that Libra is allowed!
AT 22PM there will be a huge update of this post