needed to explicitly set Defulat

app.py

@@ -1743,6 +1743,7 @@ if selected_tab == 'Data Load':
 if selected_tab == 'Manage Portfolio':
     if 'base_frame_names' not in st.session_state:
             st.session_state['base_frame_names'] = ['Default']
+            st.session_state['Default'] = None
     if 'origin_portfolio' in st.session_state and 'projections_df' in st.session_state:
         with st.container():
             reset_port_col, recalc_div_col, set_base_col, blank_reset_col, contest_size_col = st.columns([1, 1, 1, 6, 4])