I was able to get mine filed to the feds and MD last night as well. However, when I saved mine after performing the override, it put the $0 back in there. So, I got out and went back in and did the override again- this time without saving. I hit the CONTINUE button and was able to finish out.
If you don't have a top level menu (i.e. File/Edit/View/Tools, etc.), you probably aren't running Turbo Tax on Windows. My guess is that your choice of using a Mac is key to your demise. Even if you don't have the top level menu, in Windows you can right-click on the 0 on line 9 and the pop-up menu allows you to "Override," which allows you to edit the value and leave it as empty/null. Tab off of that field or click somewhere else to invoke the edits and if you're lucky you'll be clear to continue.
The 8582 for was NOT listed in my forms list- likely because of the error. However, I think it was from the Forms view that I was able to get to the flawed 8582. Above the list of forms were two icons, the right icon looking like some sort of error or stop sign (can't remember and can't get back there now). I clicked on that and was able to get into form 8582 that way.
