First off - sorry sorry - I went home leaving my box on to refresh all elevations in the project (best done over night) I didn't realise i was still logged on. Thats what 8 hours sleep over 3 nights does to ya!!
Thanks for all the replies - I knew this was gonna be a good forum.
SO.....after a 5 hour design team meeting (nice) in Glasgow (76 mi. away - nice nice) without the elevations (you get the picture) I return to the job.....
Matt - you are right about the merge common materials (I could only find a check box in the matterial definitions display properties dialogue box) and it was checked already

checked the definitions in all xrefs and they were all there.
reloaded all xrefs and regenerated all elevations but no joy.
Have opted for disguising the unwanted horizontal lines by plastering some hefty FFL lines atop and linework editing the curved facade.
ADT 2D ELEVATIONS may have won the battle this time but it aint won the war!!! :pissed:
OR i'm still doing something wrong

- Dom did you say you've managed to get these elevations to work before?
bytw what time is for you guys? Here in scotland it's 8.10pm I've never managed to get the hang of these international forums.
Cheers
N
p.s will post some of the results if anyone is interestedN