hey there ... i think i found out why the blocks looks like in my screenshot.

i have testet blockland v12 on several pc with radeon graphiccards and different drivers.
1st PC: Radeon 9600 / X1050 Series with driverversion 8.591.0.0
2nd PC: Radeon 9600 with driverversion 8.591.0.0
3rd PC: Radeon 9700 PRO with driverversion 8.203.0.0
4th PC: Radeon 9200 with driverversion 8.252.0.0
On the PC with old drivers Blockland works without any problems. On the 1st and 2nd PC Blockland doesn't work without problems ...
I'm going to install an older driverversion on my pc (Radeon 9600 / X1050). I hope i works xD