I'm really not sure what you would consider conclusive evidence, but another link that shows photos may support what I am try to convey a bit better.
http://www.taylorguitars.com/global/pdfs/wet_guitar.pdf
Note the last sentence of the first paragraph and the bit about effects of high humidity can be more costly when it comes to repair.
Well, I'm sure you will agree that wood will expand when laden with moisture and that it will shrink when in a state of low humidity, all other things being equal.
Just for the record, please note that I have in fact never once said that high humidity is just as damaging as low humidity.
I have however in my original post (post #72) said "and I learned that over humidified can be almost as bad as under humidified"
Thanks mutley600...really, I am not trying to be difficult, I just thought that people should be aware that high humidity can have serious consequences as well.
All in all, I think this is an awesome thread, as it makes people aware that fine instruments need care and that the environment in which it is stored is indeed important. One does not have to lose sleep over it, but they should be aware and take necessary precautions to avoid unwanted damage or expense.
thanks again
Peace!