Most of my .paks have been under 5 megs - does yours have an immense amount of custom video and artwork? If not, than that probably shouldn't be the case.
I wonder if perhaps the _1 is because it's trying to create a file too large, so it spills over into a second .pak?
can you try seeing what the files sizes are on your Mods/[modName] folder and your data/public/[modname] folder?
also can you confirm you're online on steam while in the editor - in the editor, if you press shift-tab, does the steam overlay come up?
finally, just for giggles, can you make it version 1.0.0.1 ? and put anything in the description? i dont think either is it, but i'm wondering if perhaps it saved the initial opening of the mod as 1.0.0.0 so is reluctant to put anything else to that version.
