Istock went from best to last for me after the new keywording system went online.  I will be lucky if in November I earn 1/5th of what I earned 2 months ago.  But I guess it's just me.  Other people report improved sales.    I guess they are getting mine. 
I just do not know what was so bad about my old keywords that they do not work with the new system.  I went over some of my formerly good-selling files - and the keywords are fine.  Totally sux! 

P.S.  Apparently their system does not believe "wave" is a word.