This issue is not unique to Blockland. You may try running Blockland in compatibility mode for Windows XP (if you aren't already using that). It would be a good idea to begin searching around the web for people who have had similar problems in other full screen games.
Someone said that changing display of icons, windows, and text from a larger size (like 150%) down to a normal size fixed it for them.
It seems this happens to a lot of people and no one really knows the solution.