Okay, some background:
I haven't got the first idea on how to use the mapping tools and am only going to be able to install them once I've downloaded the latest dev release that includes Radiant, but yesterday I encountered a map bug with the Bridge map (the one with the big railway bridge). Unfortunately I didn't have the foresight to take a screenshot, that only occurred to me later. I also have crap-all experience using the Sourceforge bug tracker to report this properly, so I figured posting here would be the safest bet.
Near the dropship, right below the cliff there is a fenced area with a car hulk, boxes, coils and other random junk scattered around that can provide cover. There is one place there that has some sort of glitch that either screws up the movement calculation algorithm or does something else. It is a corner between a big overturned industrial coil reel and a stack of boxes.
When I moved a soldier there, he got stuck. He could move into that square just fine, could turn around in it, but he could NOT move out of it again. The first time I tried to move him, the game deducted the TUs required for the move but he didn't go anywhere. Same on the second try. After that, it did not even give me the option to try to move him, everything was indicated as being inaccessible and he remained in this stuck mode until the end of combat.
If someone here who understands mapmaking has the inclination to look into this, check that section of the map and possible validation issues it may have, it would probably be helpful for the game, since the way the alien spawn points and the dropship start location are set up, that particular piece of buggy real estate is THE place to take cover on that half of the map.
If the description of this issue is sufficiently accurate, maybe it will allow either a fix into the SVN or otherwise proper reporting with the relevant technical details.
Thank you for your time.