Traceback (most recent call last):
  File "electrum\gui\qt\util.py", line 1669, in on_qt_callback_signal
  File "electrum\gui\qt\main_window.py", line 429, in on_event_blockchain_updated
  File "electrum\gui\qt\main_window.py", line 1041, in refresh_tabs
  File "electrum\gui\qt\util.py", line 819, in refresh_all
  File "electrum\gui\qt\address_list.py", line 222, in refresh_row
  File "electrum\wallet.py", line 855, in get_addr_balance
  File "electrum\address_synchronizer.py", line 502, in f
  File "electrum\address_synchronizer.py", line 838, in get_balance
  File "electrum\address_synchronizer.py", line 785, in get_addr_outputs
  File "electrum\address_synchronizer.py", line 777, in get_addr_io
MemoryError