Initially, I had a problem viewing any drawings made in the main model window of the program. This has since been rectified by downloading another version of the software from a 3rd party website. While that problem was fixed, a similar issue exists now where viewports created in draft sheets are not showing any figures unless they highlighted by the user. I tried running the program in Windows 7 or Vista compatibly mode, but no luck in resolving the issue. Not sure if this is a problem with Windows 8. Has anybody else had a similar problem?