I am so happy about the new release of Slackware 14.0 that I immediately started to reinstall my test boxes.
The first is a Slackbox with LVM and LUKS encrypted partition. Ẃhere I have my hard-drive partitioned the same way how it is described in the README_CRYPT.TXT.

/dev/sda1 /boot
/dev/sda2 /LUKS-LVM

I have completed such installations successfully several times but now I was surprised that I couldn't choose /dev/sda1 for /boot. I just cannot see my partition /dev/sda1 in the list.

I am going to try another installation on different box.

Are you sure you added /dev/sda1 partition to be mounted at /boot when installing? I have just seen this error as I am doing basically the same as you. It turns out that the problem was that I forgot to add /dev/sda1 mapping, so the installation put /boot on the root, which is in the LVM part...

I think I could fix this by hand (copying the contents of the old /boot to the new one in /edv/sda1 and fixing /etc/fstab), but I thought it would be safer to go the slow route: run setup again and let it do the job right.

I added the partition exactly as you noted - manually into fstab and copy the content from the existing boot before I run mkinitrd... .

When I first run setup (in this installation) at point where you choose / ,/home I exit the script and verified whether the /dev/sda1 exists. It was there and I rerun the setup but all I could see was:
/dev/cryptvg/root
/dev/cryptcg/home
/dev/mapper/slackluks

I will see whether the second install on another box will give the same result.

I just finished reinstalling and confirm that now lilo works and sees /dev/sda1 as /boot.
All is well.

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What do you mean with "now lilo works"? It means that you tried the installation of such encrypted system and it works for you - or something has been changed and now it works?

I am asking because I tried to do everything from the beginning and I found out that at step "Setting up root Linux partition" I can still see the /dev/sda1 partition in the list. But after this step when I choose /dev/cryptvg/root > Format with ext4 > I get back to the Step "Setting up other Linux partitions" and here in the list of devices I already cannot see the /dev/sda1.
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EDIT
Ok it looks like there is some problem with that hardware (HP Proliant micro N36L) on the other box it works (I can see /dev/sda1 - maybe hardware bug).

Thanks for your answer