If you have any placeable treasure that you can place in your inventory (harps, horns, plates, braziers) remove them and try to start it only using coins. These things where cancelling the purge for me no matter where I placed them.

As for my experience, the official server I’m at has mega bases that take a whole map square or more. After the update, If I try to play in any of those areas the thralls just flat out stop responding. Most of these people also put them in high traffic areas, so I can’t do any of the content.

I’m off in a corner doing purges for now