Why does line count change so much from D2007 to D2010?

Question

Our app at work is a huge project with over 3000 units, weighing in about 3.5 million lines of code.

...or at least it was when we were compiling it under D2007. We

Answer 1

It looks like it is a bug. The correct line number is still reported under Project | Information. See Nick's answer to a similar question.