The more worldgen mods, the more chances for problems. It is also depending on the world seed since the worldgen is random. GT, RWG and Glens Gases together likely do not go into loops all the time. Trying a few times might generate a world that works first, but allways has a chance to loop while generating more of the world. GT and Glens Gases alone allready have a small chance of looping, RWG only rises the chance a lot.
Problem GT5 veins and in other mod gen, more dungeon size(include GT in local game) in mods, and more chance world not gen and shutdown java. Why it is impossible generate over fact that has generated? Or generate a specific location or chunks if it is a conflict? It seems that the processing of exceptions is a repeated attempt to generation in the same place or very near what fundamentally not the right solution. Simply check the area much, if there is something that prevents insert or replace the unit forced to wait another operation mod. GT should ignore if veins have been damaged or replaced by other generation
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I have same problems. (with gt 5.07 too)
notified to glen gases mod creators....
look at ./world/region : a lot of empty regions was created...
old version of glen gases seen works fine...
I found at least 10 mods that are incompatible with Greg