Hi! To reproduce the bug, take the following steps (in v1.6.1):
1. Go to Tasks tab.
2. Set filter option: 'Assigned to'.
3. Set the filter value to a user.
-> Now in the 'og_user_ws_config_option_values' table there are two modified records: option_id=34, value='assigned_to' and option_id=35, value=a:b (with some a and b integers)
4. Now change the filter option to 'Milestone', but don't change the filter value.
5. And change the Status e.g. to 'Pending'.
-> In the table the record with option_id=34 changed its value field to 'milestone', but the value of option_id=35 remained a:b, which causes an 'execute_action' error.
6. Now if you don't push the 'Back' button but instead refresh your browser, the Tasks tab won't work any more.
I hope it helps. Cheers, cocinerox
