You do not need to deactivate BPS to turn BPS Login Security Off. You can turn BPS Login Security Off on the BPS Login Security page. I believe that you can also turn TML Login Security Off too, but I am not totally sure about that.
Activate BPS again and check your BPS Security Log. If BPS is blocking something then you will see that error logged in the BPS Security Log. If you see an error logged then post it.
As of BPS .47.8 Security Logging / HTTP Error Logging has been added. If you are experiencing a possible plugin conflict or some other issue or problem on your website check the BPS Security Log tab page for any errors related to the issue/problem. Create a new Topic and post the error message that is related to the issue/problem.
If you think that BulletProof Security is causing a plugin conflict or any other issue on your website that is causing something not to work, then please use these steps below to take BulletProof Security out of the equation completely for testing. There is no need to deactivate BulletProof Security because it has a built-in Default Mode that allows you to put WordPress in a default state without deactivating BulletProof Security.
1. Make a backup of your .htaccess files using BulletProof Security built-in Backup.
2. Activate Default Mode on the Security Modes page.
3. Use the Delete wp-admin .htaccess feature on the Security Modes page.
4. If the issue/problem is related to Login Security turn Off Login Security on the Login Security & Monitoring page.
5. Test your plugin or theme.
6. Restore your .htaccess files using BulletProof Security built-in Restore.
To completely uninstall BulletProof Security you would do steps 2 and 3 above and then just delete the BulletProof Security plugin on the WP Plugins page.