This is to reduce log spam from script loading, which is especially spammy for avatar movements with scripted attachments.
All important messages are at warn or above.
If you still want/need to see these messages, set <level value="DEBUG"/> in the <logger name="OpenSim.Region.ScriptEngine.XEngine"> section of OpenSim.exe.config.
This affects no other package logs, which still output at the root configured level (currently DEBUG by default).
It appears that if the viewer requests a folder containing links, we must also send the folders that contain the link targets first.
This was tested with Kokua 0.1.0 WIP though I predict it will also work with other viewer 2s
* Replaced calls to ThreadPool.QueueUserWorkItem() with ThreadPool.UnsafeQueueUserWorkItem() since OpenSim does not use Code Access Security sandboxing