Did you maybe reload a save before you opened the hall of heroes?
Do you have both inert star stones with you, or are they still in the clinic and at the crime scene?
What happens when you mouse over the hall of heroes portal, just south east of the weaver?
If it became deactivated without you reverting to an earlier save, please email supportdos@larian.com, with a description of the problem and the report.zip file generated by the
D:OS support tool (for the PC version). The report will contain system and game information, any crash dumps, and your saved games. If file size is an issue, any saves not related to the problem can be deleted (at least keep the most recent save where the hall is open, if available, the oldest where is is not and your latest save).