I've had the same problem for a while with mine as well. CCleaner, for instance, will delete the cache that just so happens to be for the icons. The problem is the server is also missing the icons. The only way I can fix it back to how it used to be is if someone would upload their old TS cache (for those who still have all the icons) and then I can reapply them to the server. Hopefully someone that still has the icons can help us out. It's annoying to me as well.
Edit: For those that show all the icons (German Crosses and RAF Roundels etc.) If you could kindly attach the icon section from %APPDATA%\Roaming\TS3Client\cache\...\icons etc., that would be a huge help in getting this sorted out.
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