Hmmmm...
For 2 major reasons I don't think that what you are seeing IS a bug :
1/- Global Usage: Pan/Crop is just such a well used feature by Vegas Users, throughout the Planet, that the Forums would already be clamoring about it. And I haven't heard/read this? Have others here? If I am incorrect please tell me?
2/- Valuable Feature: For many a Summer now, not only can a User alter the shape, size and position of Pan/Crop Window, but also ALL the extra FX and Transition Menus and so forth. Doing this in ONE session of Vegas, that this,
alter the shape, size and position of Pan/Crop Window - close Vegas and then REOPEN Vegas again and reuse Pan/Crop, its window will assume the position of the previous session.
Until I hear differently, with sight of Screen Grabs and detailed reproed, actions, I am NOT convinced or regarding this as a bug.

If you could supply a Screen Grab of exactly what you are seeing, that would be jolly useful.
However, real glad you got it sorted,
Regards,
Grazie