It's not an issue; it's by design (It's not a bug; it's an undocumented feature?)
Group 3, Cave in Mod 11 is meant for the kind of caves you use from 5119 to 6143; dungeons.
I didn't include the kind of static caves to be used under mountains like in Ry's tutorial for a couple reasons. One was that I was planning on doing a mod 11b (which I started but never finished) that was going to have those kind of caves and all kinds of variations of the sort. Another was it didn't produce the greatest results (mainly due to process being difficult for many lower order primates to understand)
Finally what I would suggest if you do want to do that for mod11 is you mod the items.txt and add something like zis:
Code:
03 1000 0000 0000 5119 4095 Cavefloor.txt
Now then you of course have to actually have a cavefloor.txt file and it should contain some static cave floor tiles and nothing else. What will happen then is you can use the cave group for undermountain and dungeon type caves. Static floortiles will only be generated on the normal part of the map.
And Syd, if you use punt's worldforge then you actually can add statics.