There will be another patch, but probably not soon. Since changes are still being made to the main game (fixes, balancing, etc) as Larian is working on the
add-on, the test procedures may get combined. Other than confirming certain fixes would be in the next patch, though, there has been nothing official mentioned.
Are you getting an error message trying to load those 3 saves?
Check the savegame folder, and see if there is anything unusual about them (marked as read-only, or a size inconsistent with the other saves, or something). Try moving the files to another folder (and back) to check if they got locked somehow.
In Vista / Win 7 the saves are in the folder
C:\Users\ %username% \AppData\Local\Divinity 2\Savegames
or in XP
C:\Documents and Settings\ %username% \Local Settings\Application Data\Divinity 2\Savegames
You may need to set Windows Explorer to show hidden files and folders (
XP, Vista,
Win 7).
Did you try doing a clean re-install of the game? A dialog for Louis may have gotten corrupt during install, or something.
Early in the game he doesn't have much to say, but after you do a few quests you gain his respect and he offers you another. If you haven't checked Louis after the beginning of Broken Valley, that might make a difference.
I fail to see how problems just on your computer show that Larian programmers are 'half assers'. Searching for Louis in the tech support forum or Louis and crash in all the D2:ED forums only returns this topic. Other than the copy protection eventually corrupting saves or crashing with an error code 42 when it doesn't detect the DVD, I don't recall any problems with crashes trying to load or overwrite specific save slots (I know you said in your other topic that you were not using a no-DVD crack). Even if the source of the problem lies entirely with the game, it is very rare, so hardly the result of 'half assed' programming.