The blank (Black Screen) log-in screen is happening to me too. i open up the client but it doesn't load anything. The only thing given is the patch number at the top left corner.
League of Legends 1.43.11_09_23_18_01 may as well -.-

yep, blank client login here too. the patch had already downloaded and installed, but when i tired to get in the login was blank, so restarted my comp and tried again. stranged thing was that the patch seemed to load again like it was having to install a second time...:/ still blank screen after though.

> as a side note, i googled the patch number (1.43.11_09_23_18_01), to see if the problem had been seen by other folks, and the first thing that came up in google was a hack to get free ip and rp. might want to check it out, i dont want you getting robbed riot. you made a wonderful free game. bad form hackers....

I have the blank-after-clicking-log-in issue.
Specs:
Processor: Intel Core I3 CPU 540 @ 3.07Ghz
Installed memory (RAM): 4.00GB
System type: 32-bit Operating System
Operating System: Windows 7 Enterprise (updated with SP 1, IE 9)
Video Card: Nvidia GeForce GT 430

I hope this helps.
(Tried installing the latest adobe AIR, reseting internet explorer, reinstalling lol, rebooting, etc)

yep, blank client login here too. the patch had already downloaded and installed, but when i tired to get in the login was blank, so restarted my comp and tried again. stranged thing was that the patch seemed to load again like it was having to install a second time...:/ still blank screen after though.

> as a side note, i googled the patch number (1.43.11_09_23_18_01), to see if the problem had been seen by other folks, and the first thing that came up in google was a hack to get free ip and rp. might want to check it out, i dont want you getting robbed riot. you made a wonderful free game. bad form hackers....

restarted again....same story but no redownload this time just the blank login. i run windows xp, intell dual core. not sure if that helps any.

it has been telling me that i am logging on to chat service for an hour now, what do?

Hello Riot. I am having the same issue here. I have recently downloaded the Dominion patch and even restarted my computer, but every time I enter a match for Dominion it always freezes the moment all the characters are chosen and we reach the screen for when all the players have finished loading. I mean it is a blank black screen once it loads after everyone is done selecting their champion and etc. I tried restarting the pc but it didn't change anything. What should I do?