I cannot open the Georeferencer in both Qgis 3.0.2 Girona and 3.2.3 Bonn. The plugin worked fine in both 3.x versions until today. It still work in version 2.18.24.
It doesn't seem to open any windows at all, so I don't think it is an issue of windows being in another screen as in some other case. I also had a look at solution suggested here: http://gis.stackexchange.com/questions/83334/georeferencer-plugin-will-not-load-in-qgis , but they do not apply to my case since I do not have a "Plugin-GeoReferencer" folder in my registry for versions 3.x.
Reinstalling did not solved the issue for qgis 3.2.3
any ideas of how to fix the problem?
+++ UPDATE +++
Same problem with the just installed 3.4 MAdeira version