If you see this occurring with a particular app but not all apps, shut-down the Focos app to clear the cache, then re-launch Focos. To shut down the Focos app, go to the top menu bar, click File, then click Quit.
For Windows:
For Mac: To shut down the Focos app, go to the top menu bar, click Focos, then click Quit.
If this does not resolve the problem, then submit a support ticket by clicking here.