I can't mov them left to right, or further to closer! It doesn't work anymore! All I can do is move them up or down... I've tried everything and it will NOT work anymore! This happened ever, since I'm pretty sure, when I defragged my PC. This is really irritating! I use the Synthesizer a lot, and to have this happen, is a big stop for me...!
I suppose you try to move blocks in the MIDI editor?
If it is the case, select the parts you have to move. Zoom in until you can get a double arrow (left, right) on an object, and move it. It is sometimes difficult to get this arrow if the object is narrow.