I believe the kumudam site has not been updating SS for some time now - I was heartbroken :-( I read the volumes 1 and 2 from the archives and upto chapter 7 in the 3rd paagam. The online site has been showing chapter 8 'Yoga mandapam' for atleast a month now.
I have been reading it from the kalki site though there was a gap between chapter 8 and what I started with in the kalki site - for those interested, it's kalkiweekly.com and it is updated every Monday. Unfortunately, they have either not archived the previous chapters it or hidden it very well. My email to the webmaster about the archives has not been responded to.