Changed settings in 1.7.15
Just for your info ( i have already solved it).
After deploying 1.7.15 to our testserver, i have found two troubles with our configuration.
We have copy of app/conf/app.conf in app/conf/local/app.conf, but with new logo.svg and config changes you need to add/change something like, othervise old png logo will show, but heavilly distorted.
login_logo = logo.svg
login_logo_width = 327px
login_logo_height = 45px
header_img = logo.svg
header_width = 210px
report_img = logo.svg
Also, we didn't had copy of app/conf/external_applications.conf and in last release
there was change of graphicsmagick_app = /opt/homebrew/bin/gm (from /usr/bin/gm) .
Before i have realized it, all representation was on import detected as binary file (instead of eg. jpg).
On next releases, i will check changes in config files more thoroughly.