viewing sheet music after selecting(deselecting) different instruments that are visible

I notice that if I go to the edit menu, select instruments, and select different instruments to be visible that weren't before and unselect the visibility of some instruments that were visible before, sometimes the view of sheet music afterwards is funky (like showing a blank line for an instrument that I selected to be visible that wasn't before, etc). However, if I go to the edit menu, select instruments again, and then click ok without changing anything, then the sheet music looks fine and the problem is fixed.... not a big deal at all since it can easily be fixed since I've had this weird occurrence happen several times and did the same thing to fix the problem which seems to fix it every time. I only mention it since I figured you guys would like to know, even if it's just a minor fluke.... but overall, musescore is an awesome program and I appreciate being able to use it. :)