The new DraftLogic Electrical Automated Drawing Validator checks, repairs, and notifies you about a wide variety of issues and potential issues with your project. See the forums entry about the Drawing Validator for details about what is checked.
One of the things that the Drawing Validator does is to automatically delete nuisance zero-length and near zero-length lines/polylines. For your production projects, this is fine as you don't have any need for these entities in an production project. Where automatic deletion is not fine, however, is when you are editing DraftLogic Electrical blocks, including block clusters. This is because most DraftLogic Electrical blocks use near-zero length polyline 'donuts' to serve as snap points for Branch Circuit Wiring connections. We want the snap points to stay on the blocks where they belong, not be transported to oblivion by the Automated Drawing Validator!
So if you ever need to edit any DraftLogic Electrical blocks, including block clusters, just go to your profile list (OPTIONS command in AutoCAD, profile selection is on last tab) and select any profile that doesn't have DraftLogic Electrical installed in it to be the 'current profile'. Usually the base AutoCAD profile is the first on the list and won't have DraftLogic Electrical in it. Once you are running AutoCAD without DraftLogic Electrical, edit the blocks as you need and save them. Once block editing is complete, make a profile with DraftLogic Electrical current and continue working on your projects.
Block editing can be tricky business regardless of the Drawing Validator eating snap points...call DraftLogic Electrical technical support before performing any changes so we can discuss what you want to achieve and plan how best to get you there with the lowest time and risk.