Argh, nevermind! Invalid path. Had to use "..\images\icon.ico" With the correct path, the icon works correctly. Issue can be closed as invalid.
Same with even a simpler icon, just 3 small layers:
Using: !include nsDialogs.nsh (...) Icon "images\icon.ico"
Error while loading icon - GIMP icon unsupported
Get rid of gtkglext dependency
To reprhase that, someone most likely forgot to tag 2018.2.2 in git. It would be good if you retroactively added that tag.
Versioning issue
Jim apologies for the late reply, here you go: https://github.com/Beep6581/RawTherapee/blob/dev/rtengine/procparams.cc#L307 P.S. Do you use GitHub? If you do, I would prefer to report there.