~/.extend.Xresources does not exist. My installation is Manjaro i3 version:
Distributor ID: ManjaroLinux, Release: 17.1.3, Codename: Hakoila, Linux version 4.14.15-1-MANJARO (builduser@manjaro) (gcc version 7.2.1 20171224 (GCC)) #1 SMP PREEMPT Wed Jan 24 13:13:39 UTC 2018
Here is the URxvt.font configuration:
cat ~/.Xresources | grep URxvt.font
I also tried changing the above to ‘URxvt.font: -misc-fixed-medium-r-normal–15-140-75-75-c-90-iso8859-1’ with no luck.
Also, the font seems installed:
cat /usr/share/fonts/misc/fonts.alias | grep 9x15
I resorted into installing st (pacaur -S st) which works out of the box. I might try urxvt again later after couple of updates hoping that the issue will be resolved. I had done no configuration at all in regards to fonts or the terminal, therefore it is more likely to be a global issue (e.g. not limited to my machine). Let me know if you come up with a workaround or fix or a configuration I could try for urxvt.