Lightroom constantly re-render previews

I know it sounds strange, but the problem is:
Anytime Lightroom opens the catalog, it renders previews. No matter they're already rendered in a previous run. Close Lightroom, open it again and it will forget any previous renders.
It related to standard-sized and 1:1 previews.
LR 2.3 and 2.4, OS Windows XP x64 and Vista x64.
I have been trying everything. Changing the disk for catalog and sources, changing permissions for folders, reinstalling LR and Windows, running Windows in Safe Mode — nothing works.
So the question is: how to fix LR and force it to build preview only once?
p.s. After initial import the catalog file size don't changed even during preview rendering. And the same for Previews.lrdata folder.

> How large is you preview folder?
In one case it is 1.5Gb size (13049 files in 13475 dirs), in another — 65Kb (1 file in 381 dir). The size don't changed during previews render.
> How many and what type of images did you import?
Catalog sizes are from 300-400 images (typical) to 15000 images (recent case). But I'm trying to split photos into manageable pieces with not more than 300 photos in directory.
File types are mostly DNG (v5.4 and less), CR2 (Canon 20D, 40D and 50D), JPG, few TIFFs and PSDs. The problem persists for any type of file.
> What exactly do you mean by rerendering (i.e. the thumbs change colour and tone or change from being fuzzy to sharp)?
Yes, all of mentioned above and of course the big writtings «Rendering preview…» and «Rendereng larger preview…» over the image in Loupe mode with color change afterwards.

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