Somewhere on this site, one of the staff posted some minor fixes that includes removing the option to ask about the Modified Hold-Out Blaster after the Black Market quest is resolved.
The modified 203b4d4.dlg is borked--the dialogue when B4 calls the player while under house arrest reverts to the dialogue you would get when you talk to him at Czerka. Because of this, the Czerka Calling quest is never given, and it is impossible to proceed (since you need both Czerka and the Ithorians to call you before Grenn unlocks the door to your apartment).