You sure you didn't delete - “” from around your new dialogues or anything else? Maybe just some formating error? And reading lgp... hmmm what compression You use to compress those decompressed field files? Ficedula LZS tool by default have exactly same compression like original, it worked for me, through I think lgp made by LGPtools worked too - well for me>.>. Anyway it's not even needed as makou reactor can export and import them hopefully without bugs. I'll try to add some custom text later and test it in game, couse didn't really tried ingame yet in editor they looked fine. Maybe tomorrow couse I'm leaving now>.>.
Edit:
Lots of testing today:3 and here are the results:
-Makou Reactor just can't save any additional text lines=], add new windows, using existing dialogues or none and finish your work inside meteor. It's not hard really, they're defined as "MESSAGE (00,ID_of_the_dialog)">.>.
I tested opening lgp files made by both old LGP tools AND Aali's LGP/UNLGP(compressed firstly with Ficedula's LZS tool) and Makou reactor opened them fine and if they had more text it showed it fine too, then saved correctly and opened and they still were there. BUT if I just imported a file with more text to makou reactor, he saved without errors, but when opening it, the new text weren't there, soo it CAN'T save more text than it opens >.> it must be programmed that way... < then it shows those random signs in dialogue window ingame couse defined message isn't there.
Soo either you can, replace the dialogues in meteor finishing your files there, OR after you add all dialogues you want, make an LGP with them that can be readed in makou reactor. Maybe really I have some different versions of those programs and they work together for me while can't for you.
If that's the case:
http://www.MegaShare.com/2360804 self extracting archive with exactly what I used - Makou Reactor, Meteor, LZS, UNLGP, LGP. Maybe you forget to LZS the edited files before making an archive with LGP and that's why your Makou Reactor doesn't read those new LGP files? I dunno really, all working nice for me.:/
Edit2: Aw I wanted to use same sharing site most people here use but choosen wrong couse name was alike:P I prefer rapidshare, so I dunno, hope that's better:
http://d01.megashares.com/dl/f4e9555/tools.exe Anyway one of them should work. xD
Edit3:
Check an working ingame example:O
http://img33.imageshack.us/g/iviewcapturedate2507201.jpg/^added 2 new texts to Barret and yeah I know they're lame:P that was JUST AN EXAMPLE of making additional/new texts working ingame without replacing old ones:O - explanation for those who'll view and say they don't want it. xD
^LOL >.> forgot to uncheck mouse cursor on capture:P well it's just an crappy example anyway...