Disappearing Thumbnails & Waveforms - How do I fix this!?

After about 20 minutes of editing with FCPX, the thumbnails and waveforms in the event browser and project timeline start to disappear, and it is INCREDIBLY frustrating. Does anyone know what is going on here? How do I go about fixing this?

I'm having the same problem as the poster above. It used to be that thumbnails and waveforms would disappear after importing media. So I would import, quit and relaunch, then edit. With each update, however, the problem has worsened, and it is now at the point where the software is almost unusable. As chacox says above, things are fine for 20 min or so, then thumbnails and waveforms start disappearing. Scroll left or right in the timeline, or up and down in the browser, and all you'll see are blank tiles. Return to what you were just looking at, and it's now blank as well.
Things I've tried:
Tweaked the energy settings in System Preferences to try to prevent the computer from sleeping.
Installed Event Manager X to restrict events and projects to just the current project.
Installed Preference Manager to trash preferences prior to each launch.
Each of these things seems to have bought me a couple of minutes before problems arise, but that's about it. Since everything initially works fine, it would seem to be a software problem where the computer "forgets" to redraw waveforms or reload thumbnails. Tweaking the thumbnail settings in the bottom right of the timeline sometimes helps, but only for the moment. I've done quite a bit of searching on this, and have so far failed to uncover a fix.
My specifics:
iMac with 3.2 GHz Intel Core i3 processor, 4 GB memory, 1333 MHz DDR3. OS X 10.6.8 (Snow Leopard)
FCPX 10.0.7 Video files are 1080i HD (1920 x 1080 / 29.97 fps) in AVCHD format output from a Canon camcorder.
I've held off updating to Mountain Lion because of legacy software issues, but this problem has arrived at the top of the list, so perhaps it's time to pull the trigger.

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