most of the times there are quite a number of new builds of wuala for certain platforms, sometimes several new builds daily and there are a lot of days where there isnt any changelog nor releasenotes to be found.
many times only days after the actual updates/patches or only several patches/releases later there is an updated releaselog.
this is a high risk of getting some "updates" for wuala from man-in-the-middle and similar risks.
i wish that the wuala team would really announce their changes immediately, write some official buildnumber/list and maybe even some hashcode, signature or way to make sure that the wuala installation is the official code.
as wuala becomes more widespread and common out there, the probability of suffering attacks and tampered updates/patches becomes more likely.