Weeks of frantic technical work appear to have made the government's health care website easier for consumers to use. But that does not mean everyone who signs up for insurance can enroll in a health plan. The problem is that so-called back end systems, which are supposed to deliver consumer information to insurers, still have not been fixed. And with coverage for many people scheduled to begin in just 30 days, insurers are worried the repairs may not be completed in time. ''Until the enrollment process is working from end to end, many consumers will not be able to enroll...