When open any flow the execution details are empty.
Checking the logs we found the following error:
2018-10-31 15:53:11,743 [workerScheduler-3] (SqlExceptionHelper.java:146) ERROR - ORA-01653: unable to extend table HPOO.OO_STEP_LOG_BINDINGS by 8192 in tablespace HPOOTBS
It means that this table is getting full. Please engage your DBA in order to increase the OO_STEP_LOG_BINDINGS tablespace of the issue or truncate the OO_STEP_LOG* tables.