Ram Preview - Stopping after 40 frames

Hi All,
I've recently moved to After effects CC on my home computer, and for some reason whenever I try and RAM preview it stops after 40 frames or so...
The animation is REALLY basic (full screen shape layers turning on and off to the music) and an mp3 file playing in the background.
My computer spec is:
21.5-inch iMac Mid 2011
OSX 10.8.5
2.8 Ghz Intel Core i7
16 GB 1333 MHz DDR3
AMD Radeon HD 6770M 512 MB
I have the following multiprocessing prefs:
I would greatly appreciate any help on the matter... the project seems far too basic for it to be having genuine issues with playback...
Dan

Hi Rick,
Thanks for the reply.
I've changed the .mp3 file to a .wav file and that seemed to fix everything, for the time being...
It previewed for 10 seconds fine, but after about 15mins of working on this the RAM preview area has started to shrink again and it's only previewing just over half (5 seconds).
I changed my memory and allocated 4GB to other apps, also turning off rendering multiple frames... (by the way for some reason I can't get my 'actual cpu's that will be used' to change from 0? This seemed odd). Still no change.
I've attached a screenshot of my comp details below, along with a shot of my screen when RAM previewing... (you can see the green bar does not go all the way). I'm not working with ANY footage which is why this is most peculiar, just the wav file so I can edit to the beat.
Once again if there is anything else you can think of...

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Hi all, I just installed After Effects CS4 - I have a smokin fast mchine: quadcore Zeon 3.20 GHz, hyperthreading turned on, nvidia quadrofx 3800 with current driver, 12 GB DDR3 RAM, windows 7 64bit ... can you PLEASE help me troubleshoot a problem: even on the simplest compositions, a moving picture or a moving piece of type, the RAM preview stutters along, the current time indicator hops along at a choppy pace, images in the frame dont look like they're moving smoothly, and all i get is about 6 seconds of RAM preview ... seems to me that I used to get better performance on a MUCH MUCH slower machine under windows XP ... i have looked around the forums and seem the advice on multiprocessor options and the like, but nothing I do seems to help ... do any of you have any advice for me to improve my performance??? if you have any questions about my setup or preferences, let me know, I will be on this until I get what I expect out of my (otherwise incredibly fast) machine

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Derek Reid
Trader Multimedia Inc.
www.tradermm.com
Date: Tue, 30 Mar 2010 21:46:43 -0600
From: [email protected]
To: [email protected]
Subject: AE CS4 - why such poor RAM preview on my FAST machine?
Just one thing to cut down a frequent misconception:
Your nice graphics card doesn't do much for After Effects performance.In fact, trying to use OpenGL for rendering (including rendering of previews) can cause problems.
I recommend turning OpenGL rendering off for all but interactions. I.e., choose the http://help.adobe.com/en_US/AfterEffects/9.0/WSAF696587-2D81-42e2-B248-4C5C2B7D3614a.html and turn off http://help.adobe.com/en_US/AfterEffects/9.0/WS3878526689cb91655866c1103a4f2dff7-79e8a.htm l. OpenGL is not compatible with Render Multiple Frames Simultaneously multiprocessing.
I'm not saying that OpenGL is your problem. Rather, because you mentioned your nice graphics card, I just had to stress that you need to forget about that with regard to After Effects. It's not really relevant.
It may be that the jerkiness is an issue with a bottleneck of drawing to the screen. (I don't know, but it's possible.)
Your hard disk being too slow wouldn't be an issue with RAM previews, since the frames are all cached in RAM.
>

Can't do ram preview, but why?

Hello,
I've been asking this question allready in several forums. I got a problem with ram preview in After Effects.
My PC system:
CPU: AMD Phenom II X6 1055T
Mainboard/Motherboard: GIGABYTE GA-870A-UD3
Graphic Card: Gainward GTX 460 GS 2048MB GDDR5
HDD: WD 500MB
Ram: 12GB SO-DIMM DDR3 A-Data Value 1333 CL9
Windows 7
After Effects CS5
Now when I want to do a ram preview it gives me only about 1,5 seconds, then it stops rendering. Enabling the multicore function will lead to an error message: "Not enough ram installed". When I click on "Details" in pre-settings window in AE, it tells me:
Installed ram: 12GB
Current Ram usage: 0,31 GB
Permissible Ram usage: 0,4 GB
Max. usable memory: 12 GB
Max. allowed memory: 0,4 GB
Minimum required memory: 0,4 GB
Isn't this weird? It seems like AE is not checking that there is 12 GB installed.
PS: In the settings I have set "Ram reserved to other applications" to 1 and "Ram available for AE" to 11.

I have win7 64bit.
C:\Program Files\Adobe\Adobe After Effects CS5\ and all the files are actually in \Support Files\
I've found some talk online about the problem being tied to the Dynamic Link processor. But I have allowed my Dynamic Link manager through my firewall and nothing has happened for me. I've uninstalled AE and had no luck either. I reinstalled it and the problem was still there. I re-installed the latest patch and still nothing. Oddly, I have noticed the Premiere lists my RAM for other programs at 0 now too. I had previously set that to 3GB.
Are there other .dlls I need to permit through the firewall?
http://www.videocopilot.net/forum/viewtopic.php?f=4&t=41867
http://forums.creativecow.net/readpost/2/990191
http://www.slashcam.com/EN/info/AE-CS5-max-allowed-usage-Ram---Ram-preview-performance-438 189.html
http://ftp.postforum.com/forums/read.php?f=11&i=10508&t=10508

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