The assignment did not release the original contract purchaser from liability unless the seller expressly consented to the assignment and fully released them (a novation, in effect)… which is not part of the fact pattern.So the agent is right.

Assignment:  Buyer shall not assign all or any part of Buyer's interest in this Agreement without first having obtained the separate written consent of Seller to a specified assignee. 

It merely requires written notice of mutual consent.

A person who has sent bitcoins cannot try to retrieve them without the recipient’s consent.

Without admitting or denying the SEC’s allegations, Tosta has agreed to settle the charges against her, consenting to the entry of a final judgment that orders permanent injunctions, disgorgement and pre-judgement interest totaling $117,917.57, and a civil penalty of $60,000.

If in Texas, a lease purchase option longer than 180 days without consent from the lender to receive payment from the tenant/buyer is not possible.Also, you can assume the obligations of a VA loan -- it is a non-qualified assumption - meaning the lender is not qualifying or approving of the assumption. 

There seems to be a differential feature among providers where some are a tenant opt-in service and others don't require tenant consent.

They are not allowed to do any repairs or modifications, none, without written consent.

You might have to get a parent sign off but most places let you work as young as 13 or 14 with parental consent. 

After all, if someone was clinically handicapped and not able to understand and consent to terms of the legal agreement, then the agreement itself could be declared null and void in the court of law.