When a short sale is approved, it lists a specific buyer name at a specific purchase price, terms, closing date and net amount to bank. This often take several months or more from original offer submission to the lender.
Often buyers will walk after such approval is issued. Could have been due to buyer: financing issues, inspections, layoff, market prices drop, found diff house, frustration....whatever the cause does not really matter.
At that point, listing agent will often put "pre-approved" short sale. However that is mainly just to try to get buyers interested in it compared to the other short sales. It is MARKETING, but is kinda true. The bank had PREVIOUSLY APPROVED an offer at that price. However your offer is NOT PRE-APPROVED.
Any new offer, even if for 5k above what previous offer still has to go back to the bank, who will review it and then decide if they will issue new approval letter.
The good news is that you have 95% chance of getting your offer approved as long as the purchase price and/or the net amount to the bank is equal or higher than what was previously approved.
Also, the same negotiator will often work the new offer and you are likely to get the new offer approved in a matter of days or a few weeks.
However, with Bank or America and few other lenders, they CAN make you start from scratch with new negotiator and new review of everything. They don't have to make you start over...but they MAY and often DO.
It usually will still go through slightly faster than first time since they don't have to necessarily order new appraisal, but if the previous one was more than 60-90 days old, they may have to order new one...depending on which bank/investor you are dealing with.
Switching buyers with Bank of America will often make you restart process and take weeks/months to get the same numbers approved the second time around that they already approved the first time.
The think to know is that you will almost always get your offer approved at that price...it may take a while...but you usually will get it done. Just make sure the listing agent is not going to submit another offer after yours that may bump you out for a extra 2k.
Try to get listing agent to agree to submit just yours...if they will, then you should end up getting the home.