Did you come here to 'flame'? I have no idea. I am not a LW programmer. We are volunteers on this forum. Nobody who helps on this forum works for LW.

Pro connects to two extra ultrapeers. It also has some small improvements in the search engine. That's all I know.

But if I didn't mention it earlier, some versions of LW work better on some people's set up compared to others. That has always been a common thread since I've been helping on these forums.

If you still have Pro support, send them an email. They might know why.

If you still have Pro, why not try installing LW 4.18 pro on them if 4.18 basic runs fine. Perhaps the present LW 5 just is not going to run properly on your machine.