Hi,

nothing happens when I open my .blend file and choose:
File -> External Data -> Report Missing Files

Do I have to check the report somewhere else in the folder system or so?

Thank you!

Check the content of the 'Info' editor (the one having the main menus) after you have run the operator, if some files are missing they will be listed there.

Otherwise, please attach here the file you are trying to export (with all its needed data).

Seems like this is FBX only

You answered really quickly, thank you for that.
My reply held too long, I'm truly sorry about it.

Here', what info panel says:

Traceback (most recent call last):

File "C:\Program Files\Blender Foundation\Blender\2.73\scripts\addons\io_scene_fbx\__init__.py", line 527, in execute
  return export_fbx_bin.save(self, context, **keywords)
File "C:\Program Files\Blender Foundation\Blender\2.73\scripts\addons\io_scene_fbx\export_fbx_bin.py", line 2894, in save
  ret = save_single(operator, context.scene, filepath, **kwargs_mod)
File "C:\Program Files\Blender Foundation\Blender\2.73\scripts\addons\io_scene_fbx\export_fbx_bin.py", line 2789, in save_single
  scene_data = fbx_data_from_scene(scene, settings)
File "C:\Program Files\Blender Foundation\Blender\2.73\scripts\addons\io_scene_fbx\export_fbx_bin.py", line 2192, in fbx_data_from_scene
  if tex.texture.type not in {'IMAGE'}:

AttributeError: 'NoneType' object has no attribute 'type'

location: <unknown location>:-1

Here's the link to the files:
https://www.dropbox.com/s/1vrz9thd0b14fvq/BlenderORG_FBX_help.zip?dl=0

Thank you!

Okay,

Is it because of a bug in blender, or because of the textures?

It’s a bit unclear to me, tbh. Not related with textures files anyway. But in your file (tried GasStation_30.blend), 'steel' material shall have no texture at all, and yet it does have some 'valid' texture slot. WOuld be nice to know how to reproduce that, but have the feeling this will be hard. ;)

I think it happened after the hardware change, but I'm not sure is it because of that..