I think most people having problems with version 20 aren't really having problems.I had problems,but it was with my Add-Ons,not Blockland itself.
So,for those of you still having problems,just delete all of your add-ons in the following folder:
Libraries>>Documents>>Blockland>>Add-Ons
Then copy all of the add-ons in the following folder to your Add-Ons folder in Documents:
Computer>>Local Disc>>Blockland>>Add-Ons
If your on a Mac,this might not work.
If you aren't on a Mac and this doesn't work,then its a problem with something else.