Lightroom encountered an error when reading it's preview cache

Question

I been getting this error for over 2-3 months and thought it would go away with the new version releases, i tried all the standard fixes,deleting the catalog,compacting etc. even moving it to new folder, reinstalled the software twice.  The whole nine yards. IMHO, there's a problem with the software, it may be uique with differetent type of machine setup or a corrupt file in the in the catalog and the compacting doesn't fix it.
The error always happens while in the develope and crashed, has to leave the software (sometimes it just hangs the software and you have to kill the task manually).  You have at least 10-15 seconds before going back in, otherwise it will still crash, a thread is still occuring from the orginal crash and still completing it's task. That's the error, annoying as heck.
My only hoping is a new version of LR comes out soon (4.0) and it goes away, otherwise, I'm going to find something else-- driving me crazy, I spend about 10-15% of my time each week getting out and back in to make go away, then can go for a day(s) sometimes and no problems.  I tried recreating the problem on specific photos where I think it might be corrupt, that doesn't give any clue, there is no pattern to this at all, it happens randomly on new photos and old photos, yet i can go back to those photos again and no problems.
Any NEW ideas would be appreciated (no compact, no new catalogs, new installs, turn off various options cache preview etc. move to new folder and more.....done that etc.).

Answer 1

The error is exactly what's it in  the title of the post, Lightroom encountered an error when reading from its preview cache and needs to quit.  That's it.
I don't know what else to tell you, i wish I had more.  This is all over the internet, I followed pretty much all the solutions, delete the catalog or delete the preview folders (tried both).  Tinker with the cachee preferences.   Most people kill the preview folders and the catlog gets recreated and there problem is resovled, doesn't work for me.
No cloning, totally two different catalogs (not networked etc.)  a good question though.
When I am refering to catalog and cache, I strictly talking about LR only, nothing outside of that or in the operating system, just LR files only, here they are:
I  have a   LR catalog folder called--->   C:\Users\Mark\Documents\LightRoom Catalog\LR_Catalog
you have another folder called: LR_Catalog Previews.lrdata   (with many subfolders underneath at)
and I have LR catalog filein C:\Users\Mark\Documents\LightRoom Catalog\LR_Catalog
LR_Catalog.LRCAT
That's it, a file and a folder with many sub-folders.  I'll get a screen print with error next, but it's basically what I said earlier in the beginning, you can be in develope or even the library, and error occurs in a message box, you hit ok and the application exits. On average it can happen 6-7 times with an hour and sometimes not at all, working with same the photos.  Sometimes it can happen within mintues, sometimes not at all for over 2 hours.  There is no specific pattern to it.