Not sure what is actually the problem.
If too many instances displayed, then you should select Execution column in preview tab to see those that are running.
I don't have this column. The file name is ZennoPoster.exe for this process, there are two zennoposter.exe process currently. The one is interface, the second - execution.
Try to open profile file as archive by winrar or 7 zip and delete profileindexeddb.zpindexeddb file from it.
Then load profile to zennoposter. But make backup copy of initial profile at first.
It's in development plan, but not with high priority.
We are currently focused on anonymity... integrating new Chromium engine which better emulates "real" Chrome.
I think after that, developers will be working on BotUI update.