All answers below point out to one basic premise - homebuyers, realtors, loan officers are a team and as such, all players must be on top of the game and work together. Great mortgage bankers and realtors, as professionals they are, have to make sure of this from the begining of the process.
Buyer/borrowers need to be forthcoming and respond to information requests as quickly and accurately as possible. Realtors must work with mortgage bankers on the following order - get a reliable loan pre-approval before showing property, submit offer contract terms such as seller credit, closing date, etc., after previous coordination w loan officer and buyer, and inform lender on whether transaction is moving forward after option period / inspections are done.
Loan officer and processors take file from this point, and submit a complete file to underwriter for conditional loan approval; then everyone works to meet lender loan approval conditions, in order to get file's final approval or "clear to close", and scheduling closing at title company.
In short, a clear understanding of the process by all team members and of each one's role from the start, is the best solution to avoid delays and or loan denials.
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Amcap Mortgage Bank