only four? I thought initially you were complaining about something difficult
😉
Vegas does PIP in its sleep, and not only that, will do it in 3D if you want, which is not something most other NLEs can boast. If you’re getting poor quality output, rest assured you need to read the manual, or get some training DVDs, or take a more tactful approach.
btw, if you’ve seen those HP ads that were all the rage recently, that is something easily done in Vegas, which is slicker use of PIP than most people require.
give us more info on your settings and we might be able to help. No, I haven’t looked for your previous thread.