If SM2 isn't pinning it's either a database corruption problem, a poor proxy problem, or your account is suspended.
It's easy to know if your Pinterest account is suspended. Just browse to the account page:https://pinterest.com/
To know if it's a database corruption problem:
1. Go to the Processes tab, click the "Open Data Folder" button (that will open the data folder in Windows Explorer or Mac Finder).
2. Close SM2.
3. Rename SocialMultiplier2.sqlite to something else (e.g. SocialMultiplier2.bak.sqlite).
4. Open SM2 again.
5. Add your account back and add in the pin job.
6. Give it some time to gather some pins, then select the job and click the Run Now button.
If it pins, then it was a database corruption issue.
If the account isn't suspended, and it's not a database corruption issue, then it's the proxy.