Solution 1
RESTORE "My Document" folder to default name and location.
- Right click on My Document folder
- Click on "Properties"
- Go to "Location" Tab
- Click "Restore Default" and "OK"
Solution 2
The black screen after patch happens when your fonts_en_SG.swf or fonts_en_MY.swf is not being patched completely to the game. The size for both the files are as followed:
fonts_en_SG.swf - 86, 856 KB
fonts_en_MY.swf - 70, 030 KB
fonts.swf - 15, 030KB
Hence, please ensure you are having the complete files in the LoL folder:
C:\Program Files (x86)\GarenaLoL\GameData\Apps\LoL\Air\css
If any of your .swf files is incomplete, please download the files at this link and replace the files in the folder:
C:\Program Files (x86)\GarenaLoL\GameData\Apps\LoL\Air\css