I've upgraded my firmware to the latest [Old-GUI]-Firmware. There are MacOSX specific fixes, only.
The new firmwares for N2R1 (2657 1.0.0t) and N1T1 (3718.510.t0) have been released to prevent downgrades. No cool new features this time.
If a firmware >= 2642 is installed, please disable UPnP port forwarding before upgrading. (if you encounter the issue that the NAS is no longer available >= 1h runtime)
Note: Mediaflu replaced the old DLNA (LG) media server. Due to this 'issue', the old Twonky 4 configuration page is no longer available. To access the Twonky 4 configuration page, type the direct URL into your address bar (e.g. http://lg-nas:8000/en/service/dlna.php) or deactivate Mediaflu (requires ExpertConfiguration-Package).
It's been a long time, since the last stable firmware has been released. The reason is, that all firmwares are currently under test. This was necessary, because there were a few big bugs.
If you need a new firmware (e.g. because you have to reset your NAS anyway), you can test the latest development snapshots for yourself. The snapshots are always available on NAS-Portal.org (German/English Community Board).
There are currently two versions under test:
I hope that these firmwares are stable in one or two weeks. Feel free to test the firmwares for yourself and don't forget to post your comments.