Patch 1.0.3.0 for the English version of GTA 4 fixes many different problems, including problems with graphics, multiplayer and control system. In addition, the performance of the game is increased.

Full changelog:

GRAPHICS:
Interior Lights for ATI 1900 series cards
ATI cards. (Ie, Pool Mini Game)
- ALT-TAB fixed

Graphics Settings
- Added menu option "OFF" for Reflection quality
- Added menu option "OFF" for Shadow quality

PERFORMANCE:
- Physics optimizations to improve situations with heavy physics calculations (ie 32 player races)
- Graphical Performance Optimizations

MULTIPLAYER:
NAT Type detection
- Detect if user has a "strict" NAT and displays message for user

Voice chat is received even if your microphone is turned off

CONTROLS:
Keyboard / Mouse
- Remapping restrictions removed
- Allow Enter, Backspace, and Arrow keys to be remapped by user
- Allow multiple mouse buttons to be mapped

Enable / Disable DirectInput in Menu
- Users can now activate / deactivate Direct Input devices from the "Controls" menu.
- If commandline "-usedirectinput" is active, it will override pause menu setting

Use 2 direct input devices simultaneously (ie. Wheel and Gamepad)
- Users can now use 2 different controllers at once, including 1 XInput and 1 Direct Input device

Added more Direct Input / XInput device support
- Saitek P380 / P480 / P580 / P990
- Saitek PS1000 / PS2700 / P3200 / P3600
- Gravis Eliminator Shock gamepad

SECURITY:
Detect modified files and prevent users from the multiplayer if found
- Game will prompt with a message after blocking user with modified data files from multiplayer
- Should prevent multiplayer access from cell phone and GFWL join in progress

VIDEO EDITOR:
Scroll Bar improved response
- Tweaked to respond better to keyboard inputs

Sped up load times for users with many clips

TITLE UPDATE 2 FIXES:
Return of Hot Dog Stands and other props
- Missing hot dog vendors, fences, gates, pylons should be present throughout the world

Scrolling signboards
- Activate missing scrolling signboard text (ie., Highway signs, Star Junction, Clock Tower Sign)

ALT-TAB pauses game during cutscenes
- Cutscenes should now pause and resume properly after an ALT-TAB task switch. Audio remains in sync

GENERAL ADDITIONS / FIXES:
Mismatched MODO / Perseus Clothing
- Fixed a bug when Niko mixes clothing from Perseus and Modo

360 Controller Texture
- Controller image should be visible in Controller Configuration screen