Hi all! Yep, El Capitan makes some interesting changes that affect iStat Menus.
We use
Menucracker for our menubar items. This allows iStat Menus’ icons to be reordered and has other benefits, but Menucracker isn’t working in the current OS X 10.11 beta. We think that situation isn’t likely to change in future betas or the release version of OS X 10.11.
We’re not entirely sure what the final solution will be, but we’ve made a bit of progress already. The most we can say at this point is that we are definitely aware of the issue and will release an iStat Menus beta or update as soon as possible. I am not yet sure exactly when that will be though.