diff --git a/wuttapos/app.py b/wuttapos/app.py
index 42db530..8765a35 100644
--- a/wuttapos/app.py
+++ b/wuttapos/app.py
@@ -169,7 +169,10 @@ def main(page: ft.Page):
         threading.excepthook = thread_exc_hook
 
     page.title = f"WuttaPOS v{wuttapos.__version__}"
-    page.window.full_screen = True
+    if hasattr(page, 'window'):
+        page.window.full_screen = True
+    else:
+        page.window_full_screen = True
 
     # global defaults for button/text styles etc.
     page.data = {
@@ -179,7 +182,10 @@ def main(page: ft.Page):
 
     def clean_exit():
         # TODO: this doesn't do anything interesting now, but it could
-        page.window.destroy()
+        if hasattr(page, 'window'):
+            page.window.destroy()
+        else:
+            page.window_destroy()
 
     def keyboard(e):
         # exit on ctrl+Q
@@ -194,8 +200,12 @@ def main(page: ft.Page):
             clean_exit()
 
     # cf. https://flet.dev/docs/controls/page/#window_destroy
-    page.window.prevent_close = True
-    page.window.on_event = window_event
+    if hasattr(page, 'window'):
+        page.window.prevent_close = True
+        page.window.on_event = window_event
+    else:
+        page.window_prevent_close = True
+        page.window_on_event = window_event
 
     # TODO: probably these should be auto-loaded from spec
     from wuttapos.views.pos import POSView
@@ -227,6 +237,11 @@ def main(page: ft.Page):
         elif page.route == '/login':
             page.views.append(LoginView(config, '/login'))
 
+        if hasattr(page, 'window'):
+            page.window.full_screen = True
+        else:
+            page.window_full_screen = True
+
         page.update()
 
     # TODO: this was in example docs but not sure what it's for?
diff --git a/wuttapos/controls/timestamp.py b/wuttapos/controls/timestamp.py
index d3ff2bc..5f9b201 100644
--- a/wuttapos/controls/timestamp.py
+++ b/wuttapos/controls/timestamp.py
@@ -25,6 +25,8 @@ WuttaPOS - timestamp control
 """
 
 import asyncio
+import threading
+import time
 
 import flet as ft
 
@@ -43,7 +45,13 @@ class WuttaTimestamp(ft.Text):
 
     def did_mount(self):
         self.running = True
-        self.page.run_task(self.update_display)
+        if hasattr(self.page, 'run_task'):
+            self.page.run_task(self.update_display)
+        else:
+            # nb. daemonized thread should be stopped when app exits
+            # cf. https://docs.python.org/3/library/threading.html#thread-objects
+            thread = threading.Thread(target=self.update_display_blocking, daemon=True)
+            thread.start()
 
     def will_unmount(self):
         self.running = False
@@ -56,3 +64,9 @@ class WuttaTimestamp(ft.Text):
             self.value = self.render_time(self.app.localtime())
             self.update()
             await asyncio.sleep(0.5)
+
+    def update_display_blocking(self):
+        while self.running:
+            self.value = self.render_time(self.app.localtime())
+            self.update()
+            time.sleep(0.5)