At least once you have the battle tower you will have easy access to your necromancer, so can talk to him before trading if you have parts to upgrade.
Have you noticed disappearing body parts when trading with merchants in a character started after installing the patch? AFAIK this issue wasn't mentioned in the patch notes, though, so I wouldn't restart for this if you are still playing with the same character.
If you didn't email support@larian.com about your earlier mention of this problem (
Locke is a [SPOILER]?!!!), you may want to do so now. Maybe a save where this happens could help them determine what the problem is, assuming it is with the save itself rather than the game (in the latter case the
support tool may help).
If you are so inclined, see Lar's post
here on how to send them an Xbox save.
With the PC version, in XP the saves are in the folder
C:\Documents and Settings\ %username% \Local Settings\Application Data\Divinity 2\Savegames
or in Vista / Win 7
C:\Users\ %username% \AppData\Local\Divinity 2\Savegames
You may need to set Windows Explorer to show hidden files and folders (
XP, Vista,
Win 7).
