WRITE CONFLICT: This record has been changed by another user since you started editing it...
Oh really. But there is nobody else in the record!
This can happen if you have Bit fields with NULL values set to default to 0 and NOT allow NULL (you designed the table wrong the first time and changed it retroactively). When you edit the records in Access it changes the Null to a Zero by itself, and then you change the value to what you want....and it gets confused thinking there are multiple updates happening. The trick is to add a Timestamp column to the SQL table and make sure you have a primary key. Problem solved!
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