i'm guessing your maximizer and command settings are not quite right.

check each command... look at the value for 'region'
then go to maximizer, left click the region you think it is... and check the name at the top.

if it says 'region2' ... then your command must say 'region2' (no quotes)...
some people have thought '2' would be enough. it's not. it must match exactly

and how do you play anything at full screen? you mean windowed, but using the entire screen? that is fine