smush errors: API timeout + curl problem

HI Gurus,

Just transferred web hosts, and smush isn't working now. I get the following message:
Smush request timed out, You can try setting a higher value for WP_SMUSH_API_TIMEOUT.
Smush request timed out, You can try setting a higher value for WP_SMUSH_API_TIMEOUT.
Error posting to API: cURL error 6: Couldn't resolve host 'smushpro.wpmudev.org'

Can someone give me some idea about what's going on here?

I'm using SiteGround and they're pretty awesome, so not sure what the dealio is.

Thanks kindly,