I am using this hotfix which replaces Penumbra.exe:
"-Removes a crash when loading Infected Corridors(Level 16) that happens when the player is leaving the Chemical Laboratory(Level 19) with the "substance", this is a rare problem that only happens if the player has done some things in a particular order."
Replacing Penumbra.exe again with your ati-fix will remove the earlier hotfix, right?
I am sure you probably used the original Penumbra.exe when you started making this ati-fix.
Could you not use the fixed Penumbra.exe (see above) to fix the ati-problems? If this is not to much trouble since Im sure you are almost done with the whole fix.
Unfortunately no good news today. During the final testing two serious bugs have been found and they really need to be fixed before release.
We expect to be able to have it all done by tomorrow, the update is now expected to be released sometime during Tuesday or maybe Wednesday depending on how long it will take to locate the bugs, fix them and test again.