Flushing data in progress

Connected to a windows server trying to profile a dotnet core application. 

Deployed the Remote Agent, connected, and picked running app to profile. 

Window opens to start profiling, but a progress bar stating "flushing data in progress" permanently stays open going from 0% to 100% in about 10 seconds, then it just repeats.

Tried pressing "Detach from process" now the button is just flashing while dotTrace continues to "flush data"