In my opinion, wait for the next revision. Issues with the compiler may cause an element to render and not be invisible. Note that this is a random event and may or may not be the same element every time you render. My designers tell me that this can be solved by converting an object to nurbs. This is ok with them, because they are more concerned with renderings and like the batch rendering command. Converting our whole library to nurbs to correct a VW glitch would not be an option. You could, on a per drawing basis, symbol to group/ convert to nurbs as our designers do but, that's up to you.
Sorry for the rambling reply but, I've been using this product since minicad 4 and this version of VW could have waited until the bugs were gone.
Please read the other posts on this board, a lot of good info to be found.
Good Luck,
jangle