This blob issue is apparently a flaw in the panel itself and can't be easily fixed with just a firmware update, from what I've heard. It was corrected in the 50 series, so it's a gamble talaga sa VT30.
I think our local sellers cover their units with warranty naman. So if anybody is interested with this unit but is deterred by the green blob thingie, i suggest you give it a test first and if its clear of the green blob then buy it.
If for some reason you get it within the warranty period which I highly doubt, then return it.
I think that is more than enough coverage for any prospective buyer against this green blob issue.
And seriously, you really have to consider the excellent PQ this Tv can give you at the price point that they are being sold.
Cheers!