Leon Kennedy
I have just spotted this post.
Are you using the latest version of Dark Egypt (Dark Egypt-V2) which should be available to you in your 'Order History' on your profile page?
This new 'V2' version has replaced the original version and the one main difference is that there are now 'individual' ceiling segments instead of ceilings being added automaticly when placing rooms in
the FPSC Editor.
Which version of FPSC are you using?
I ask because from FPSC v-9.0 (I think?) and onwards a new 'automatic ceiling' feature was coded into FPSC which I have found causes problems with removing and adding floors and ceilings when useing the Dark Egypt V2 Pack.
This 'automatic ceiling' feature can be swithched off but I can't remember how it is done at the moment but I will search and find out and post back here to let you know when I find the method.
This is most likely where the problem is.
Hope this helps for the moment and I will get back to this asap.
Good luck
Ps....It might also help to have a look through the Dark Egypt PDF Manuals if you havn't already done so.
They can be found at the bottom of the page in the link below:
http://www.fpscreator.com/pack8.html