Sudden Dropped Frames Problem with 720p24 material

After sailing along for months with perfect operation from Final Cut Pro, editing 720p24 (I'm still running 5.0.4), I have encountered a mysterious hangup that I can't seem to solve. It probably began shortly after I was doing a test on a new project and mistakenly used a 44khz sound file rather than a 48khz. That project ran fine for a couple of days as I played with it, then abruptly began to drop frames at very particular points. I trashed the sound file and reimported it as a 48khz file and that seemed to fix things for a day or two. Then, to my utter horror, when I opened a very large ongoing project that I needed to tweak, I found that the dropped file problem has corrupted my entire FCP operation. I have tried changing various settings, such as unlimited RT, and trashed the preferences as well, but none of the straightforward cures seems to make a difference. I've also looked at all the suggestions in the Apple dropped frames article at [docs.info.apple.com]. I have never had a problem with dropped frames prior to this.
My scratch disk is a raided SATA drive with plenty of space to spare. This setup has worked flawlessly since July. I have jumped around over the past 10 days from work on old SD projects to 720p24 projects and have been changing settings here and there to accomodate this. Nothing else seems to have been changed that may account for the glitch.
I have not reinstalled the software.
Anything that comes to mind as a logical next step would be most appreciated!

Yes during panning or zooming I can see that frames are dropping in the stats panel.
I'm encoding at 500kbps video + 48 audio, outputting only one stream.
The content in the input monitor shows exactly what the cam is seeing, with the pan and/or zoom correctly displayed. On the output monitor side the action will freeze momentarily when frames are dropped. Then the display will skip to the point where no more frames are being dropped.
The native frame rate for the cam is 29.97, but as an output, averaging in the dropped frames the rate may drop as low as 27 or 28fps according to the stats panel. The difference being the number of dropped frames.
FMLE is installed on a Dell Studio 15 with 4 GB RAM, which I would think would be plenty adequete.
Thanks for your response.
Adninjastrator

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