I've had no problem adding to my library and I was able to edit my prefs too.

The reasons I edit the file manually are when I add several runtimes at once, I can do it faster or if I want to reorder the library. I like the runtimes alphabetical and they get out of order as I add more later. It was also a fast way to move the runtimes from one version of poser to the next, I just copy and paste the lines I need. I think I did that for the last two upgrades.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
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I use Poser 13 and win 10