I have just finished the part where the Enclave killed my father. After going through the Citidel, I wanted to go back to Rivet City. Passing by the Jefferson Memorial, there are force fields around it. Once the force fields appear onscreen, if I walk away from the memorial, the game CTDs; and if I try to save my game, the game CTDs.
So I tried a bit of google research, and I got the impression that Broken Steel has some element that involves the Jefferson Memorial (I haven't made it that far, so please no spoilers). Based on that info, I tried disabling Broken Steel, but still CTD. Then it occurred to me that I have the unofficial FO3 patches installed, so I should install the Unofficial Broken Steel patch along with Broken Steel. Did that, and I was able to save my game with the force fields onscreen for the first time. Then I tried it with Broken Steel active but the Broken Steel unofficial patch disabled, and it also worked fine to save. Here's my mod list (with the Broken Steel Unofficial Patch disabled):
Fallout3.esmAnchorage.esmThePitt.esmBrokenSteel.esmPointLookout.esmZeta.esmUnofficial Fallout 3 Patch.esmUnofficial Fallout 3 Patch - Operation Anchorage.espUnofficial Fallout 3 Patch - The Pitt.espUnofficial Fallout 3 Patch - Point Lookout.espUnofficial Fallout 3 Patch - Mothership Zeta.espDarNifiedUIF3.espArwen_Encumbrance.espArwen_Hard-Core.espArwen_Realism_Core.espArwen_GOTY_Realism_Core.espWeightAmmo.espBetter Stimpacks with Weight.espDisplayedAmmoWeight.espTotal active plugins: 19Total plugins: 20
Any feedback would be appreciated. Thanks.