Long time Blocklander, first time poster.
I've encountered some small issues that haven't been reported yet. First is that this version seems to run a bit jerkier than version 10 did, even with physics off. By jerky I mean a few times every second it'll lag for about a tenth of a second. It sounds minimal but it's pretty noticable. I have encountered this running on someone else's server and on a local server. I run Blockland in Wine but I've had someone running Blockland under Windwos confirm. My specs are Intel Core 2 Duo E6750 @2.66Ghz, 4GB DDR2-800 RAM, Nvidia GeForce 9800GT 512MB.
Another problem is that duplicator is causing my server to crash randomly. I know this is a third party addon but I couldn't find any information on it on the boards so it might just be related to Wine. Any Windows users who have been having this problem please confirm.