Welcome to the forum.
Can you please post the full specs. of your MBP, including the I/O, i.e. HDD's?
You mention "many formats," but for troubleshooting, it might be useful to go with one of the problem formats, and concentrate on that, with its full specs.
Also, can you list the specs. of your Sequence, as that might play a major role in playback issues.
When placed onto the Timeline, do you have colored bars above the Clips? If so, what color?
Good luck, and TIA for that info.
Thanks for your help so far. There were a few MBPs in the building of
the same build that had the same problem. As well as trashing
preferences I found that the problem was due to there being two user
accounts. Even though Premiere was installed and launched in the admin
account, playback as a standard user would not work until the admin
account had imported and played video. That seems to have sorted out the
problem with most machines. Mine however is still not playing ball and I
am running out of ideas so any more help would be much appreciated.
Here are the details you asked for:
It is MBP6,1 and has a 2.53 Ghz Intel Core i5 processor. The memory is
4GB 1067 Mhz DDR3 and is running Mac OS X version 10.6.8.
I am importing from the G-Drive Mini (4 gen) 500GB and the file is a
QuickTime movie, Codecs DVC - PAL, Linear PCM
The sequence is a DV-PAL standard 48Khz and and when placed into the
timeline the clips have a red bar above them.
Hope this is useful info and I hope you can help