I'm using pam_mount to mount and encrypted luks partition on top of LVM.
Pam_mount version 2.10 always removes a mount point even when stated in pam_mount.xml to not remove it.
System: Ubuntu 12.04 x64 beta1
pam_mount version 2.10
I've had the mkmountpoint enabled with enable=0, remove=false; enable=1, remove=false; and completely commented. Everytime when I reboot the mountpoint gets deleted.
After I login to the system and create the mountpoint manually the mount command works normal.
Let me know if you need more details.