Borderlands PC Update 1.30 Notes

Addressed issues:
- Invalid weapons or items can no longer be loaded into the game
- Brick’s Centurion class mods now regenerate health correctly
- Brick’s Bombardier class mods now regenerate rockets correctly
- Roland’s Tactician class mods now regenerate shields correctly and display the correct bonus values
- Roland’s Rifleman class mods now apply damage increase to all machine guns
- Certain powerful legendary item names should now be displayed in the appropriate color
- Opening the bank in the Mad Moxxi DLC no longer prevents other players from moving
- Multiple copies of DLC missions can no longer be obtained
- Corrected some incorrect icons in the ammo vendor
- Fixed a crash caused by killing the final boss while zoomed in with a scope
- The “Careful, he bites” achievement should now properly unlock when playing in French
- Added icons to the server browser that indicate which DLCs the server has installed
- The server browser now displays the name of the DLC a server is playing instead of the plot mission
- Adjusted scrolling in menu options in long server lists
- Added a notification if a player attempts to continue a game saved in DLC that is no longer installed
- Fixed DLC notification dialogs that were not closing properly
- Alt-F4 no longer closes the game if it is not in focus

Balance adjustments:
- Chests in New Haven have been adjusted to contain more appropriate loot
- The duration of daze effects has been reduced to 6 seconds, and the amount by which it decreases the speed of enemies and their projectiles has been reduced
- Damage from shock elemental effects has been increased
- Repeater pistol damage has been slightly increased, accuracy slightly decreased
- Sniper Rifle critical hit bonus has been increased

http://www.neoseeker.com/news/13201-borderlands-1-30-xbox-360-patch-released-ps3-pc-versions-to-follow/

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Keep in mind, if you install this new update you will NOT be able to use modded weapons any more.

I wonder what is their definition of an invalid gun or item is.