Upgraded to 7.2 and totally lost audio output

I wonder if anyone can help.
I have upgraded from 7.1 to 7.2 logic pro. now when i try to open songs i've been working on, i get no audio output at alll, just some nasty clicks and pops.
all tracks look like they're playing and show bouncing meters, but the master output is showing no audio output at all.
this only seems to happen on songs i had started in 7.1 because if i just load up logic and start a new song there's no problem.
i thought an upgrade was supposed to iron out problems not create them!
anyone had the same problem or got any ideas i would appreciate hearing from you.
my system:
G5 dual 1.8 Gig
mac OS 10.4.6
logic pro 7.2
audio interface - Novation X-station

i've tried disconnecting the X-station and running logic on built in audio but exactly the same happens.
after more messing, i've found that there are a whole load of songs which won't play audio, these are all in one folder and are an album project.
other songs in other foldres seem to play OK.
i haven't made any changes to the folder and am totally confused as to what is happening.
when i open these songs and press play, i get a horrible click or pop but then no audio. however when i press stop i get the reverb tail of an audio track.
i thought i'd finished the album which is why i thought it was safe to install the 7.2 upgrade, however now the artist wants a few changes and i can't do anything at the moment.
andy
Do you get any sound from any sessions other than
what you've described?
Does this also happen with internal/BuiltIn Audio?
J

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