I'm not thrilled with these problems with Omniwallet.
Does there any other payments method? If SPHRE will listed in any exchange, maybe is better to wait and receive earned coins directly on exchange wallet.
Usually the coin devs are "not thrilled" on the option to send the bounties directly to exchanges, because psychologically people may not sell so easy if the money is sent to user wallet, even if that's an online service.
Also offering the choice to sell before the ICO ends could mean to offer you the choice to compete against their price. Not a good business.
On a happier note, Omniwallet works now for me.