We are using domain mapping plugin version 22.214.171.124 on WP install 4.1...We have updated the network as well...this is a multisite. We recently moved the this site from one host to another, we updated the IP used within the Domain Mapping plugin to correspond to the new host, as well. When submitting the url within the plugin to set up domain mapping, it just puts up the wheel to think, then it stops and nothing changes. All of the old domains that were previous mapped still work...we're just having this issue on the new one that we are creating. Thanks in advance!