This will be fixed today, hopefully even released in 1-2 hours from now. When rewriting the whole Virtual GPS system we missed the polygon tool. From a file system perspective it's not a part of Project-GC, but written as a plugin for the map engine (Leaflet). Therefore we missed the fact that it used virtualgps-code, and we just didn't think about it. The single add/remove just happen to be 100% compatible, while the bulk add/remove isn't.