>>Maybe it wants (or doesn't want, depending on what you have) the curly braces delimiting the GUID value.
>>

>No curly braces in the GUIDs - just 32 digits and four dashes.
>
>In any case, the wizard works so well without tweaking (love the way it adds time stamps) I just use it as is, including using bulk inserts and then wrote tsql scripts that convert the c(36) to UID and set the PKs

If anyone finds this thread later, you DO need to put the curly braces on GUID fields for bulk loading to work (seem to be related to bulk loading via XML, not just the upsize wizard). Not sure if the dashes in the GUID are required or not (ours had them).