The fix for this issue will be deployed in HostNet for hosted customers the weekend of 4/14/2018-4/15/2018. For self-hosted customers that have upgraded to 14.60 and have this issue, we have a patch to fix this that can be applied to your system. Please see the Blackbaud.com Downloads page for the 14.60 patch to apply to your system if you have already upgraded to 14.60 and have this issue.
For now until the fix is deployed, the work around will be to go directly to the IRS website to retrieve this information:
https://www.irs.gov/charities-non-profits/exempt-organizations-select-check