Sometimes, when launching SilverEfx Pro (your latest version from this week) from within Affinity (1.10.4), SilverEfx launches, but NO photograph (from Affinity) appears within the edit pane. Launching the same version of SilverEfx Pro as a standalone, with the same image(s), appears to work normally.
I shut down Affinity and Silver Efx Pro, and removed the SilverEfx shortcut that appeared menu bar at the bottom of the screen (running iMac software version10.15.7). I then re-opened Affinity, re-loaded the image, re-launched SilverEfx Pro from within Affinity and then things worked as expected.
This behavior appears to be sporadic.