Thank you very much.
You can write a how to fix the bug with Babl?
I learn how alone to compile Gimp for Windows.
I have deliberately let the console window stay in this version since this is an alpha build and it would be useful to see if there are any debug messages for the developers...
You can however write how switch off this console ?
Yes, I will detail how to fix the bug. Basically Babl is now looking for format information in cairo.dll and friends who are located in the babl-0.1 library. You have to created an environment variable called BABL_PATH (see the source code) so that BABL can find the formats. This is all new for 2.9.
I do this with the installer for both the regular version and the portable version.
The portable version is self contained. You need to run gimprun.exe which sets up the environment for itself before running Gimp. it also automatically takes care of moving from drive to drive.
Switching off the the console requires you to modify app/main.c so that the console window does not show up. That is about the easiest way to do it, though I currently don't recommend doing it.