Safari grinds to a halt downloading a large jpeg

I have been trying to download a Wikipedia Picture-of-the-Day 20MB jpeg from the Wiki website. Lovely panorama of Keswick in the UK Lake District. I receive about 10% of it but Safari then stops and I watch with some trepidation as Safari's memory usage climbs. And climbs. Thinking it's about to go bang, I quit Safari when this reaches 3.5 GB. Any ideas why this is happening?
21in iMac 3.06 GHz Intel Core 2 Duomemory 8GB, OS 10.6.7

From your Safari menu bar click Safari / Reset Safari. Select the top 7 boxes, then click Reset.
Restart your Mac.
Try downloading that file again.
If you still have problems, go to ~/Library/Safari. Move the Downloads.plist file to the Trash.
Quit then relaunch Safari. Try again.

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For years I have used Apple's recommended standard technique whenever I wanted to download a Flash video embedded in a YouTube page to my hard drive:
- Open a YouTube page and click on the video's "play" button to get it started;
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HOWEVER, sometime very recently (not sure when, exactly -- a few weeks or months ago) YouTube has changed the way its pages are coded, so that this technique no longer works. When I open the Activity Window, instead of seeing one large loading video file that's easily identifiable, I see a whole series of large files, all exactly 1.7mb big (no matter how large the file size of the actual video in question is), and they constantly increase in number -- at first there are two such files, but over the seconds and minutes more and more appear. Furthermore, many files with no named size are constantly loading and then disappearing. And here's the whole point: I've tried double-clicking on ALL of these files, dozens of ways on dozens of YouTube pages, and none of the are the video file I seek and none of them cause the file to download to my hard drive.
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To see what I mean, just go to YouTube, load any random video page, and then open Safari's Activity WIndow and try to download the video that way.
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How can I fix the problem? Is there some other lesser-known built-in way for Safari/Mac to download the new kind of YouTube videos? Or is there some reliable freeware or shareware or plug-in or extension or whatever for Safari that would enable YouTube downloading?
I tried a freeware program called "Evom" that was highly touted, but it too was thwarted by the new YouTube code and failed to extract any videos from the YouTube page, even though that's what the application was designed to do.
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Carolyn:
I just now did exactly as you recommended. Result? No change.
Even after trashing the files and restarting and everything else, the Activity Window and YouTube behave exactly as they did before.
(I had actually previously tried something very similar to your recommendation, and it didn't have any effect then either.)
In case it's helpful, here's an example of what one of the mystery components that load endlessly in the Activity Window is listed as:
http://s.youtube.com/s?rendering=software&lact=102489&decoding=&rt=112.382&et=11 0.829&tsphab=1&st=69.939&tspne=0&tspfdt=262&nsiabblmin=62945.000&nsidf=2&tabsb=1 &ad_flags=0&h=360&nsiabblmean=72646.865&md=1&docid=zPxFu7taftE&bc=15194849&csipt =watch5ad&ad_event=3&el=detailpage&hasstoryboard=1&vid=72A5TVVpDgRoXDV3HvMeKPjLx BFdU61DC&fmt=34&cr=US&sd=BD075E8E6HH1336502192683396&vtmp=1&nsiabblmax=79054.000 &hl=en_US&ns=yt&nsivbblmax=774478.000&referrer=None&sidx=0&hbd=7790924&w=480&hbt =2.751&cid=6&sendtmp=1&sst=0&cfps=25.974025974025974&screenw=1440&mt=0.6&vq=auto &playerw=640&playerh=390&slots=sst~0;sidx~0;at~2_3&scoville=1&at=2_3&volume=100& art=1.842&mos=0&plid=AAS_iqoqfi0mjNc0&fs=0&nsivbblc=208&nsivbblmin=561638.000&bd =931267&allowed=1_1,1_3,2_1,2_3&bt=7.441&fvid=bNz97ILtwqc&screenh=900&len=127.92 &vw=480&nsivbblmean=668895.024&nsiabblc=208&vh=360&fexp=912001,914050,913539,919 306,907217,901802,906507
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http://o-o.preferred.comcast-lax1.v11.lscache8.c.youtube.com/videoplayback?range =1781760-3563519&expire=1336524839&id=ccfc45bbbb5a7ed1&burst=40&cm2=0&sver=3&upn =I_VxE0Lmh4Y&keepalive=yes&ipbits=8&algorithm=throttle-factor&itag=34&sparams=al gorithm%2Cburst%2Ccp%2Cfactor%2Cid%2Cip%2Cipbits%2Citag%2Csource%2Cupn%2Cexpire& source=youtube&signature=6F9B5B2CA58ACBA6AFE02FB8A54F1F74EE2B0F16.8E421BC37C3019 E806C22CF3E8866847D033565C&factor=1.25&ip=71.0.0.0&cp=U0hSS1VNUl9IU0NOMl9NR1ZJOm lxNTVmbm1vcDlO&key=yt1&fexp=912001%2C914050%2C901802%2C906507%2C907217%2C919306% 2C913539

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