Since we should be able to copy a jpg, png or gif from the file browser and insert them as thought icons. I must admit I haven't tried it before, but in there is just a blank area created in front of the thought name. There is no icon shown. 
Regards Hans Henrik Nørregaard
TB 9.1.9 (Pro Combo) Windows 10 Pro 64-bit Java 1.8.0_151
Are you experiencing this problem with all image files, or just some? Can you post an example file where you are having this problem?

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