REFER TO THIS ONLY IF HUBS SUGGESTION DOESN'T ADDRESS IT
Bergy: based on your other thread, you may be having some hard drive or game install issues. When you stop hearing sounds and now field icons are missing, these point to something else that may be going on since no one else is seeing it.
Here is my suggestion:
Run maintenance on your hard drive (defrag, checkdisk, etc). Once that is completed, try to reproduce the problems again. If you do, uninstalled AH2, defrag again and reinstall (make sure you back up things like your sights, sounds and settings folder, although, these may be corrupted so you may have to re-apply these). Then test again.
Also, for future issues like this you will want to post to the technical support forum as these don't really appear to be "bugs" but technical issues on your system.
Hope this is helpful.