I think I encountered a couple of bugs here:
a) if I "close" a portfolio the "save" and "save portfolio as" options do not get grayed out. Clearly if there is no portfolio open saving it is meaningless.
b) if you "close" a portfolio without saving it there is no warning and you lose everything you did. I actually hit this and lost an hours worth of work (thankfully I had saved all the investments, but all the portfolio hierarchy etc went away). This is bad - you should always warn before throwing away data.
- Sharad