I bought MYFX Extension for After Effectcs, when I click on MYFX from the Extension section, it does not open. It does not appear on the screen. Please help.
Since this appears to be a Mac, I would assume it's once again where the secondary files associated with the script/ plug-in can't be loaded. Check the visibility of your Library folder and also the permissions on the relevant script folders.
Sorry about the issue. Have you tried reaching out to the plugin manufacturer to know if this is a known issue for them? You could also try resetting your preferences. If you're using a multi-display setup, try opening the plugin using a single display.