Thanks. I can't answer your questions offhand but I'll check in on that when I get to work tomorrow.

My computer has two NVIDIA Quadro FX 580s. Driver version 9.18.13.697.

Switching off GPU acceleration resolved the rendering issue. I really appreciate it.

It's nearing the end of the fiscal year and I have money to spend or my dept. won't get it next year.So what sort of graphics card would I need to install to utilize GPU acceleration? I jumped from version 9 to 13 and I know they started the whole GPU acceleration in Vegas 10 so that's why I've never had the problem before.

I noticed on some other posting that you were quite happy with your GTX 460 (granted it was over a year ago). Even then you were better equipped than I am currently but is it that my video card is too outdated?

Should I upgrade to a GTX 7XX or 6xxto enable it? When they were ordering building my computer I have this vague memory of the I.T. dept telling me that Sony was recommending the Quadro over the GeForce line and now I'm not seeing anything on Sony's site anymore. Recommendations are welcome budget set at $973 and some odd cents or should I look for another place to spend the money?

And any solutions would have to support 4 monitors.

You should try and get either a HD6970 which can handle 4 monitors or 2x GTX580; all these cards are only available at eBay but these are the fastest cards you can currently and each shouldn't be more then USD150.00. You may want to hold on until the new 800 series from Nvidia is released and tested; maybe we get lucky and a newer card finally works with VP13.

You should also try different frame rate settings to see if flickering will stop. Regarding GPU acceleration - this is a suckers bet at best as the time gained can be only measured in seconds. SONY has only bench marked with nVidia graphics cards, and with versions 12 & 13, only with the GTX570. All the other cards that are faster, more memory, more CUDA cores - forget these things. They are ALL aimed 100% at gamers. There is NO money in making cards for video editors. NONE. Use two GTX570's linked to get 4 monitors But very few cards will output true 1080p HDMI to all of them and definitely not 4K.
One fianl not. Stay away from Kepler architecture. Vegas Pro doesn't recognize it. Your best bet - the GTX-570.

The GTX570 and GTX580 are almost identical cards. The GTX580 however has more CUDA cores and will have about 15-20% higher performance. I had two GTX570 and swapped them out for 2x GTX580. I also can recommend HD6970 or even two of those.

For NVIDIA, the best drivers currently are 296.10 and 334.89.

I started getting random flickers last year with Dell XPS machine on V12 where I wasn't using CUDA. It became so bad and so random that I bought a new machine.

AMD FX(tm)-8320 Eight-Core Processor, 3500 Mhz, 4 Core(s), 8 Logical Processor(s)

NVIDIA GeForce GTX 760 - Driver Version 9.18.13.3788

I've ran acceleration on/off and never sure if render will have flickers. Sometimes its good, sometimes it's a fraction of second black screen, sometimes part of screen white or black square or pixelized type flicker. I've re-booted so no programs are in background and that will sometimes help, but I'm never sure.

The only common think I've found is that I think it started after installing Bitdefender. I've disabled that when rendering but flicker can still happen. So I'm just not sure.

From suggestions I'll never enable CUDA again, but I'm not certain that's the only problem I'm running into.

Would love to find permanent solution. This has been a real time sink... it means I have to watch full 30 minutes of video every re-render to make sure (since location will sometimes move with new render).

i have been having beans with this issue and constant crashes.....been with vegas from Vegas 8. But honestly.....I am considering switching to Adobe Primier.