Some news of the front...
First, I precise that it's only a beta version (or less??) because I have not made enough tests,... But you know, when a place is too familiar to you, you become blind to corner's bugs.
Thanks to the replies, particularly of Zo Kath Ra, much of the bugs are easy to correct once pointed out, essentially clipping or glitch problems (heighmap and elevations issues for the most), invisible walls missing and so on.
Capacity to move almost freely implies that the player can miss essentials parts of the story, running in a dead end without a single thought on what to do next...
So I add some initials clues.
I have also reduced the number of some monsters, although their heavy presence in some areas is a part of the story (and alternatives solutions may be found by the player)
On memory usage, I have removed or replaced a bunch of textures (more then 15 Mo on the dat file; it weight now 150 Mo). As I have said before, personally I haven't had any memory problem at this time, but perhaps it depends on configuration and OS.
I decided to made a new complete test (it can't be "complete", but I will try

) before uploading the resulting version, so, my friends, you have to wait some days more...
As soon as the version is ready, I shall send you the downloading link.
A shot of an old city:
