Strange anomaly between PC and Mac XML formatting

I’m currently working on a Flash/XML project for a client who is a Mac user. I use PC’s.

We’re both using Dreamweaver to edit the XML pages, and the odd part is, a line break in a paragraph done by me is interpreted as a 2 line break (ie there is a blank line between the 2 lines, like a new paragraph) and a line break by the Mac is interpreted by Flash as just a normal line break, moving the text to the next line down.

Has anyone experienced this? And if so, do you know a way round it? Either to have the PC generate a 1 line break, or the Mac to generate a 2 line break to match the PC’s output.

I think it’s actually the PC that’s at fault in generating a 2 line space for just a break.