I'm sorry if this is in the wrong place. I honestly wasn't sure where to place this. If you say that an 'I-don't-understand-this' belongs in the general forum until it is decided whether or not it is a bug, I will do so in the future.ORIGINAL: Alfred
This is not a bug and the discussion should not be conducted in the Tech sub-forum.
Read this thread on upgrades.
http://www.matrixgames.com/forums/tm.asp?m=3604034&mpage=1&key=squad%2Cupgrade?
Alfred
However, I read the full thread which you linked (and the one it links to in its last post) and I don't think it describes what I'm seeing - or only the half which I was already aware of.
Since my original description left a lot of people confused I compiled this screen:

In the first turn (501 to 502 in tracker) the Cmbt Eng of the 1st Division (top) upgraded exactly in the way I'm used to and that is described in the thread Alfred linked: Since it is a squad/engineer type device the number of Cmbt Eng 1943 in the pool is not reduced by the upgrade.
In the second turn (502 to 503) something happened to the 2nd division (bottom) which made it lose its 12 combat engineers. Looking at tracker (very bottom), they seem to have upgraded to 43 Version and gone to the pool. Unless I missed it, this second behavior is not covered in the thread and I have never seen it before.
