I was using so far r22118 mentioned in the wiki for my TL-WR841ND v8.2
The device is currently in 'router' mode(WAN disabled) as I have more of them linked.
I tried 27506 at you recommendation, but it has a major issue for me: the LAN stops working - becomes unidentified network(network unreachable, IP is not assigned, etc). Of course, I was using the same exact settings.
After moving back to the previous firmware everything is back to normal.
Any idea if this is a know bug and can you recommend a different build which is newer than what i have?