Prueba a ejecutarlo desde la ventana de "simbolo del sistema", con "gimp /?" o "gimp /help", a ver que parametros puedes usar.
Te pongo la ayuda de la version GNU/Linux:
Usage:
gimp [OPTION...] [FILE|URI...]
GNU Image Manipulation Program
Help Options:
-?, --help Show help options
--help-all Show all help options
--help-gtk Show GTK+ Options
Application Options:
-v, --version Show version information and exit
--license Show license information and exit
--verbose Be more verbose
-n, --new-instance Start a new GIMP instance
-a, --as-new Open images as new
-i, --no-interface Run without a user interface
-d, --no-data Do not load brushes, gradients, patterns, ...
-f, --no-fonts Do not load any fonts
-s, --no-splash Do not show a startup window
--no-shm Do not use shared memory between GIMP and plugins
--no-cpu-accel Do not use special CPU acceleration functions
--session=<name> Use an alternate sessionrc file
--gimprc=<filename> Use an alternate user gimprc file
--system-gimprc=<filename> Use an alternate system gimprc file
-b, --batch=<command> Batch command to run (can be used multiple times)
--batch-interpreter=<proc> The procedure to process batch commands with
--console-messages Send messages to console instead of using a dialog
--pdb-compat-mode=<mode> PDB compatibility mode (off|on|warn)
--stack-trace-mode=<mode> Debug in case of a crash (never|query|always)
--debug-handlers Enable non-fatal debugging signal handlers
--g-fatal-warnings Make all warnings fatal
--dump-gimprc Output a gimprc file with default settings
--display=DISPLAY X display to use
Igual iniciandolo con alguno de estos parametros puedes arrancarlo. (por ejemplo el de no-cpu-accel, o el no-fonts, quien sabe...)
