SOE broke the Claim window by adding a Version number to their claim window and doing a check against that for Claim windows that hadn't been updated. Since I updated faster than they could put in their check, my perfectly functioning window doesn't pass their new check
To fix this...
Open eq2ui_popup_claim in NotePad.
Find
Code:
UserResizable="true">
Replace with
Code:
UserResizable="true" version="2">
I'll look into reported button issues in the error dialog box.