Yes. Leaving the US without advance parole results in the abandonment of your I-485.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.
Generally, a current legal F-1 status permits one to travel abroad and return. However, check with Bahamas authorities whether you may require a visa depending on the country of your citizenship.
Also, even if you file I-131 Re-Entry permit for your subsequent status now it may take much longer than four weeks to receive the approval of your I-485 and travel with the new adjusted status on the issued I-131. You may seek further clarification from the counsel of record who assisted you prior to departure.
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