There are in fact two patches for X2, both of which you need to install. The second is for Windows 7 compatibility. It is all contained in a Sticky post towards the top of the forum with a fairly obvious title:
http://forum.corel.com/EN/viewtopic.php?p=175188#175188
Not quite sure which post of mine you mean. But our recommended procedure for standard def DVDs is to do your edits, then depending on how long it is, render the project into a DVD-compatible mpeg-2 using Share > Create Video File > DVD (if the project is an hour or less long). If longer, then use Share > Create Video File > Custom, and make sure you lower the bitrate: to around 6000 kbps if the project is around 90 minutes; and 4000 kbps if it is two hours. You will get an extra 10 minutes to fit on extra if you use either Dolby or mpeg layer 2 audio.
Once the new file is rendered, you can play it back to make sure the titles have come out correctly. Then create a new project. Don't bother giving it a name. The objective is just to clear the timeline.
Then select Share > Create Disc > DVD. The burning module will open and you insert your newly created file. Proceed from there with building your menu.
The only other thing you need to check is that in the middle of the three icons in the bottom left of the burning screen, the box beside "Do not convert compliant MPEG files" is checked.