I run into this all the time. You must render portions of the timeline with the slides to avi then substitute the avi on the timeline where the old files are then select the old files and remove them from the project. This will free up tons of memory and you must do all the zooms before you render to avi. If you can keep the stills around 500k on the timeline generally you won't have to do this. Vegas sucks up memory by the tons. That's why I am looking at boards with 16 gig capacity. I can't afford them but I am looking at them.
> I always scanned at 300-500dpi depending on the photo size.
I usually don't scan at greater than 300dpi. I do lots of photo montages with pans and zooms and I find that 300dpi is plenty of resolution. I’m sure the additional 200dpi at HD dimensions is taking up a lot of extra memory that isn’t really required. This is one way to reduce your memory footprint.
> So, does Vegas have limitations as to how much memory can be used? Is there a preference setting I’m overlooking?
I thought I read somewhere that Windows XP can only use 2GB of memory. Also I read that there is a registry tweak you need to make to override this but I only have 1Gb so I never bothered with it. The other 2GB is available for applications to use but if Vegas is not specifically useing it, and all memory requests are being paged to the swap file, then you are up against the Windows 2GB limit.
Others who have 4GB of memory will probably have better advice than me on how to make the most out of it.
Reading your initial thread your machine performs the same as mine, and I use 10 seconds duration for my stills sometimes at 1.5 megs.
Crawls, blurs, pans on 3d track motions, and large stills will choke the crap out of vegas memory and that's why some people use 8 gig of ram. Win2K will go to 32 gig of ram but XP seems to be locked in at 4 gig and that depends on whose board you are using.
I have had the EXACT same problems with a very similar situation. Hi-res stills, panning / zooming. At about 1.5 M, the computer stalls. CPU goes from 98-99% to 0%, and have to use WTM to close Vegas. This is only on Vegas 6. The same montage works fine on Vegas 5.
I have a dual Xeon P4 3.4 with 4G RAM. I've tweaked the configuration settings so that XP will use 3G of the RAM instead of 2G, but it hangs in the same place every time (I should say, it hangs at the same memory usage point every time).
Sorry to hear that you are having problems, but I'm glad that I'm not the only one. I've called Sony technical service, and they didn't have any helpful suggestions. I've also submitted two entries to their technical support, and they have only answered one of them. I submitted these at least two weeks ago.