Steps for reproduce:
- Export a LAR with large size.
- Try to import that LAR. In the middle of importing process, shutdown server (it's important to shutdown when process haven't finished yet).
- Startup server.
- Try to import another LAR. You will see the new import is "Queued" and there is one "In Progress" that causes new processes to not start.
If it's solved there shouldn't be any "In Progress" process after starting up server.