This is a known bug that will be fixed in the upcoming 2.0b Vegas
update.

dragos wrote:
>>I downloaded the demo version of Vegas2(I am very familiar
>>with Vegas1) but I ran into some problems. I can't see the
>>waveform while I record. More, when I stop recording and I
>>don't keep the take I end up with an empty event where the
>>track should've been. If I keep the take it says "building
>>peaks" and than it displays the waveform. The setting in the
>>options menu (show all waveforms etc.) didn't help at all.
>>Can anyone help me?
>>Thanks
>>Dragos