SmartPASTE and FindOMatic don't work well together
When pasting lists with FindOMatic installed (which comes with ImportOMatic and installed automatically for Blackbaud hosted clients), you will find that during the paste process of long lists of data FindOMatic's window will pop up and interrupt the process.
There is a simple solution though, go to the ImportOMatic plugin and within the Configuration->FindOMatic > Uncheck Enable FindOMatic. If you want to turn it on again later that is fine but just during the paste process it will stop long pastes of data.