Sorry, but I have a problem; let me explain it through an example:

There are three figures: one Dwarf (D), one Goblin (G) and one Elf (E); Dwarf and Goblin are engaged, Elf is at medium range from engagement..

DG + + E

If Dwarf makes one manouver to disengage from Goblin and going to the Elf he should be at close range from Goblin and from Elf, right?

G + D + E

Ok.

But if Dwarf wants to disengage from Goblin but doesn't go ahead Elf, which is the range between Dwarf and Elf? Going on throught scheme the positioning will be this:

G + + E

+

D

Which is the range between Dwarf (D) and Elf (E)?

You have to apply trigonometry.

Seriously, the Dwarf can choose, depending if he is disengaging away or towards the Elf, or in a place somewhere in between these variations.

It could be D - E = 1 manouvre distance (disengage towards)

or D - E = 3 manouvre distance (disengage away - opposite direction)

or even 2 manouvre if he disengaged verticaly (90 degrees)

Even better, the GM can decide. Probably there was only one way to disengage due to enemy and scenery position.

You shouldn't view "Engaged" as a range. It's more of a status. When you disengage, you aren't moving as far as you would be were you changing ranges.

If the Dwarf disengages, he is still medium range from the elf. Whether he moved away from or towards the elf, the distance wasn't enough to alter the range.

First of all: thank u for your kindly replies!

Then:

Doc, the Weasel said:

Ok, then: if Dwarf disengages and doesn't go towards or away from Elf, he's still at Medium range from Elf.... right?

So, using previous scheme, where '+' are points of range (+ = close; + + = medium):

G + + E

+ +

+

D

Correct?

Instead: if Dwarf (D) moves away from Goblin (G) and from Elf (E) he will be at Long range from Elf?

D + G + + E (?)

Imagine cocentric rings of range. (I hope these come out right...)

http://yfrog.com/n3wfrprangebasej

I've included an ork to the example to help. The Dwarf, Goblin and Ork are all at close range to each other. The Dwarf and Goblin are engaged with each other (shown by them touching). But they are still in close range to each other, as well as to the Ork. The Elf (in the second ring) is at medium range to all three of them.

Now, the Dwarf spends a maneuver to disengage. All that means is he moves his figure so it isn't touching the Goblin, but it remains in the "Close Range" ring:

http://yfrog.com/j3wfrprangedisengj

Again, the Dwarf, Goblin and Ork are all at close range to each other, and the Elf is still at medium range. But until someone takes a maneuver to move from Close to Medium (or Medium to Close in the case of the Elf) their range to each other doesn't change. For instance, imagine the Ork spends a maneuver to change ranges:

http://yfrog.com/9fwfrprangequestionj

In this instance, and I may be wrong and welcome correction, you have to rely on GM judgement. I would say that the Dwarf and the Goblin are still in close range to each other, and the Ork and the Elf are both at medium range to the Dwarf and Goblin, AS WELL AS each other. But again, that's based on my judgement. Another GM might decide different, or (hopefully) would use the setting to decide the relative distance.

But the important thing to note regarding your question is that the range did not change until the Ork (or someone) took additional maneuvers to change the range. Engaging or disengaging from another character does not change the range itself.

And please, if I'm wrong about any of this, someone please correct me.

Nope, you've got it right RARodger! That is exactly how it works.