Could you check your browser's console? It sounds like something breaks along the way and there should be messages about that.
Viewing post in 1.6.0: archipelagoes, adding and removing towns comments
Perilous.js:22299 Uncaught TypeError: Cannot read properties of undefined (reading 'get_filters')
at com_watabou_perilous_mapping_elements_Header.exportAsPNG (Perilous.js:22299:113)
at com_watabou_perilous_mapping_MapView.exportPNG (Perilous.js:19325:15)
at com_watabou_coogee_ui_MenuItem.onClick (Perilous.js:5557:10)
at com_watabou_coogee_ui_MenuItem.__dispatchEvent (Perilous.js:1142:15)
at com_watabou_coogee_ui_MenuItem.__dispatch (Perilous.js:1882:73)
at openfl_display_Stage.__dispatchStack (Perilous.js:60268:16)
at openfl_display_Stage.__onMouse (Perilous.js:61544:9)
at openfl_display_Stage.__onLimeMouseUp (Perilous.js:61203:8)
at Array.tmp (Perilous.js:61004:4)
at lime_app__$Event_$Float_$Float_$Int_$Void.dispatch (Perilous.js:41089:16)