The _mapIter == _uuidCatalog->_orderedCollections.end() comparison in UUIDCatalog::iterator::operator== fails on Windows DEBUG builds if _mapIter is invalidated. Change the meaning on iterator equality for UUIDCatalog::iterator to prevent this.

The _repositionIfNeeded method also has a bug: it returns false if _mapIter is now at the end of the map. This should return true because the iterator has actually been repositioned.