As of Tuesday afternoon (PST) 4/8, FastSpring's servers were patched for the Heartbleed vulnerability.
As a general security precaution and best practice, Friday afternoon (PST) 4/11 FastSpring SSL certificates were rotated.
Like most other internet companies in the wake of the Heartbleed vulnerability, we suggest as an extra safety precaution you change your SpringBoard passwords. The best way to accomplish this is by first logging in with your old password, then clicking the "Key" icon in the upper right toolbar. An action will appear on the right labeled "Change Your Password".
There is no evidence of any breach or concern. These are general security precautions and best practices which are highly recommended.