Reporting4Act! does most of its interaction with Act! through the Act! Data Providers, but it also connects directly to the Act! program through the Act! SDK. A variety of issues can cause problems with this SDK connection, and since Reporting4Act! only uses it in minor ways, it's possible to simply disable the SDK connection. To do this, add a ConnectSDK=No item in the [Options] section of data.ini.

[Options]
ConnectSDK=No