One change that ck made that might be relevant is he removed the ability to get the stats for each worker via a single "workers" URL. Instead if you have multiple workers for a given bitcoin address, you have to get their stats from the "users" URL now.

So for example with my address, this doesn't work any more and results in a 404 error:

http://solo.ckpool.org/workers/18mztP2vq8u79oBPjFvTrMpy53mKHiFQNt.gekko1

But this will provide the info for all workers associated with a user address in a new "worker" JSON structure:

http://solo.ckpool.org/users/18mztP2vq8u79oBPjFvTrMpy53mKHiFQNt

Perhaps that's what's breaking the current gekkorun implementation? Maybe it's not that hard to fix, but I have no visibility into the code.