Answer:
If you are unable to withdraw from Curve on Arbitrum using Wseth-eth, it is likely due to a transaction error. You should first check if the transaction was successful by looking up the transaction hash on the Ethereum blockchain explorer. If the transaction was successful, then it may be due to a delay in the Arbitrum network. You can try to re-submit the withdrawal transaction and wait for the Arbitrum network to process it. If the transaction still fails after multiple attempts, then you should contact Curve support for further assistance.