Problem when selecting contacts from list in phone screen

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I have a rather irritating problem when selecting a contact from the list in the phone screen. Most of these contact are listed there without a number. When I select them to dial the number I get an error message "phone does not support this action" (I have a dutch ROM version so I guess this is the correct translation).
When I select contacts from the contact list, this problem does not occur. I have had some discussions on a dutch forum (tweakers) and found out that it probably only happens to users who sync through exchange.
Can anybody confirm this problems and maybe help me with a solution??

If not, what is the best way of contacting HTC with this problem.

If the problem is not clear please say so, i will try to make some screenshots (what program should I use for that?)

Tim B

Is there nobody with an idea to solve this?? Or with the same problem??