At the core of the problem is enormous uncertainty about exactly what these securities ...The implosion of the $300bn auction rate securities market nearly four months ago is continuing to cause huge headaches for investors, regulators and debt issuers. In most cases, banks usually close loans more quickly than a mortgage broker does. This is probably because a mortgage broker deals with two types of persons - the lender and the client. Resolving mortgage issues between these two is a time-consuming job.