Did you try disabling the Mercury Engine? Did you try downloading an older videocard driver? Try these suggestions and let us know how it goes. From what you posted you seem to be very knowledgeable so my suggestions might seem too basic, sorry if they are.
You should have read the limitations of the trial. It is clearly stated on the download page.
The trial does not support any thing MPEG, including your material.
You are only number 547 to ask this question in two weeks time, which shows you are not unique.
Ah, I missed the trial part of it...
Thanks for the awnsers.
So far i understand the lack of straight playback but not supporting shouldn´t end in driver problems (i thought at date). Hmmm, everbody talkin bout how nice mercury is but how should i now test if CS5 is worth to buy.
I will get some other footage to check if the mpeg is the problem.
I tired about 7 drivers, from dell over dell isv to nvidia and nvidia perf... everytime the same problem.
CS5 is extremely stable. I have yet to crash it... and oh boy, we have a really good
student here who can make a Mac crash. She hasn't managed to crash our Pcs yet.
I am sure you won't be disappointed if you go with Premiere, After FX and Photoshop. A bit of a disappointment is the fact that my favourite program, After FX is not accelerated, like Premiere... booo! Still, After Effects has enough improvements to warrant a new version.
nvidia 197.59 performance driver
I am using that driver for my Quadro FX3800. No problems.