Another workaround for me is to enable the widget layer.
1. In the CompizConfig Settings Manager filter for "Wiedget Layer" and enable the tool
2. Create some widgets which will show and make not of the "Toggle Widget Display" shortcut - F9 by default
3. Close CompizConfig Settings Manager
4. Wait for the autocomplete to stop working
5. Hit F9 (once or sometimes twice) and autocomplete will start working again
Another workaround for me is to enable the widget layer.
1. In the CompizConfig Settings Manager filter for "Wiedget Layer" and enable the tool
2. Create some widgets which will show and make not of the "Toggle Widget Display" shortcut - F9 by default
3. Close CompizConfig Settings Manager
4. Wait for the autocomplete to stop working
5. Hit F9 (once or sometimes twice) and autocomplete will start working again