I don't use GIMP but I understand it is image editing software. That might be a too simplistic description as I have seen it recommended often in these forums and it is well thought of.

I am not entirely sure I understand why it would be looking for Font data when it loads, but I assume that users can add and edit text to images and that would make sense. Gimp would search the system for installed Fonts.

So, that might be a clue. Are there any corrupt fonts installed on this system? If a font is corrupted then I can see that some software that needs fonts might fail when searching for them and/or attempting to retrieve font details. Not sure how you can check this and since I don't know what OS you are using that's all I can suggest.

Have you made any additions or changes to fonts recently? Any other problems noticed on this system lately?