UrBackup Server/Client 2.0.4 beta (with Mac OS X client); Restore 2.0.1

Hello,
with 2.0.4, I’m noticing one (blocking) problem: the backup starts indexing, then hangs. The client log shows a lot of:
[…]

2016-02-13 04:13:47: SQLITE_BUSY in CQuery::Execute Stmt: [END;]
2016-02-13 04:13:47: Active query(0): END;
2016-02-13 04:13:57: SQLITE_BUSY in CQuery::Execute Stmt: [END;]
2016-02-13 04:13:57: Active query(0): END;
2016-02-13 04:14:07: SQLITE_BUSY in CQuery::Execute Stmt: [END;]
2016-02-13 04:14:07: Active query(0): END;
2016-02-13 04:14:17: SQLITE_BUSY in CQuery::Execute Stmt: [END;]
2016-02-13 04:14:17: Active query(0): END;
2016-02-13 04:14:27: SQLITE_BUSY in CQuery::Execute Stmt: [END;]
2016-02-13 04:14:27: Active query(0): END;
2016-02-13 04:14:37: SQLITE_BUSY in CQuery::Execute Stmt: [END;]
2016-02-13 04:14:37: Active query(0): END;
2016-02-13 04:14:47: SQLITE_BUSY in CQuery::Execute Stmt: [END;]
2016-02-13 04:14:47: Active query(0): END;
2016-02-13 04:14:57: SQLITE_BUSY in CQuery::Execute Stmt: [END;]
2016-02-13 04:14:57: Active query(0): END;
2016-02-13 04:15:07: SQLITE_BUSY in CQuery::Execute Stmt: [END;]
2016-02-13 04:15:07: Active query(0): END;
2016-02-13 04:15:17: SQLITE_BUSY in CQuery::Execute Stmt: [END;]
2016-02-13 04:15:17: Active query(0): END;
2016-02-13 04:15:27: SQLITE_BUSY in CQuery::Execute Stmt: [END;]
2016-02-13 04:15:27: Active query(0): END;
2016-02-13 04:15:37: ERROR: SQLITE: Long running query Stmt: [END;]
2016-02-13 04:15:37: ERROR: Active query(0): END;"

The servers stays in “Indexing” state, the client continues with:

2016-02-13 04:19:06: Looking for old Sessions… 0 sessions
2016-02-13 04:49:07: Looking for old Sessions… 0 sessions
2016-02-13 05:19:08: Looking for old Sessions… 0 sessions
2016-02-13 05:49:09: Looking for old Sessions… 0 sessions
2016-02-13 06:19:10: Looking for old Sessions… 0 sessions
2016-02-13 06:49:11: Looking for old Sessions… 0 sessions
2016-02-13 07:19:12: Looking for old Sessions… 0 sessions
2016-02-13 07:49:13: Looking for old Sessions… 0 sessions
2016-02-13 08:19:14: Looking for old Sessions… 0 sessions
2016-02-13 08:49:15: Looking for old Sessions… 0 sessions
2016-02-13 09:19:16: Looking for old Sessions… 0 sessions
2016-02-13 09:49:17: Looking for old Sessions… 0 sessions

and everything is stuck this way.

This seems to happen only on larger servers, and not on first (full or incremental) backup, but on second/third after restarting the client.