The choice of glue is certainly important and humidity, heat and the presence of microorganisms can certainly affect this. I think of greater importance in different climates are the questions of extremes of relative humidity (extreme low rh usually causes more difficult long-term problems that are harder to fix) and, as various people have correctly pointed out, the differential rates of expansion of the different woods and other materials (bone, plastic, etc.) used in the construction of the guitar.

As I mentioned in the original thread, Lakewood have some useful advice on their website concerning these problems and I'm going to try my first clicky blue thing to put a link to the English part of their site (look under Lakewood-tips) in case anyones interested.

All the best,

mcmoo