HHmmm... I see source code & nothing else in there... could we see an executable maybe we could test it nudge nudge? Or do I really have to do all that compiling myself?
CaPmt.cs is missing from your rar.
Also, it would be better if you packed the tree architecture along with the modified files - much easier for other people to replace each files.
Once you'll include the missing file I might be able to test it out