add a breakpoint at the start of the microflow and see which activity causes the issue.
Another tip: when running localy, stop and start the app completly instead of redeployment. The fast deployment of Mendix after page nd microflow changes is awesome. though sometimes after multiple deployments obbjects in the state, new version of the model colide. a full stop and start refreshes the whole model and state.
If there is no error in mendix console, can you tell what is the error message in your browser console click , right click on the broswer and click inspect option, go to console tab and check any error has occured