thanks for the quick reply, I can actually work at 23.98 or 24 in my Avid (6.5) obviously this is a somewhat new development. I can also view the footage on my broadcast HD monitor at either frame rate (or indeed any flavour of PAL or NTSC). What I am wondering is when FCPX says 108024p if it is doing anything to the true 24p quicktimes in the timeline- ie retiming them in some way.
Thanks for the info Gary, am well aware of the issues with 24p playback on televisions- this is digital only and is at 24p for a reason. It is for the very reasons you have outlined that I posted this question! And yes as someone who had edited on FCP since the days of cinewave I am aware that other NLEs can handle 24p. FCPX being a new beast to me had me worrying that it was treating 24p as 23.98- as we're both aware 23.98 or 23.976 is frequently called 24p.
What do you mean by "combining some renders"? FCP X uses project settings for a timeline, which can either be manually or automatically set (based on first clip). Both 23.98 and 24fps are available options. in the settings menu.