[quote=rickerhk]Cleaning the DLC with an old version of FO3Edit (.30 I think) can cause it. The old problem of stripping the PLD2 subrecord. I reported it awhile back and they fixed it for FO3.
Or a TTW mod that edits their packages that got touched by an old version of FNVEdit. Or cleaning the converted DLC with an old version of FNVEdit.[/quote]
This is still caused by TTW Fixes, and until 2.7 gets released there's no fix. Even then there will only be a fix when I rebuild the whole mod.