I just installed and started using Grid and really like it so far. As of 2 days ago, everything worked fine, including post-patch. But yesterday, I started getting an error message from Gridstatushealer, saying that "attempt to index field 'Healcomm' (a nil value).
GridStatusHealer uses HealComm as optional library, which does not come with the addon itself (but if another addon installs it, it is used). It's possible that either the GridStatusHealer has a bug in checking for the existance of that library, or you have another addon that installed that library and it might be a buggy/out of date version. Peragor is the maintainer of the addon, so he'll probably follow up soon.