Title kinda says it. I am running a server for me and 3 other people. To which i seem to be the only one who is having an issue with this. I run the server off my PC that i also play on. Some system specs, i7-4770k cpu, 16gig ram, 7970 vid card, and win 7. Im also using java 7 64bit update 60. These crashes dont seem to effect the server, its just been with the client. I will sometimes crash on startup of FTB, crash before it hits the main minecraft screen. Other times it will crash when trying to log into the server. This doesnt happen that much when it does just restarting the launcher fixes it. Once in a while i will be doing something and it will just randomly crash. But alot of times the game runs fine and i can play for hours with no issue. The main issue is that twice now the game has crashed and wont start back up unless i redownload my monster pack and re add the mods back to it. Thats the one that bugs me. Im going to combat this by getting a fresh monster pack and adding all my mods and then making a back up save of it incase it happens again i can just swap them out. Like i said i seem to be the only person who is having this issue out of 3 other people. I do mess with more mods then they have been since they are all pretty new to most of these mods. Here is a list of mods that i added to the monster pack along with what pack i pulled them from originally. I was told there is universal config files in all the packs you should be able to swap mods around. But some of these mods im replacing in the monster pack with updates ones from other packs. So i dont know if i should be changing the config files out for these too. Agrarian Skies Hunger Overhaul Harvestcraft Waila Iguana's Tweaks Pams Harvestcraft TiC Tooltips Tinkers Construct Tinkers Mechworks Tinkers Steelworks Direwolf20 Ars Magica 2 Hats Morph Plugins for Forestry Translocator Horizons Extra TiC Forbidden Magic Keithy Utils Metallurgy Magic World 2 Player Beacons Witchery Now i do disable some of the mods from monster, here is those. Some of them i had never messed with and looked them up and didnt intrest me so they are off to try and bring the mod list down. Highlands Bibliowoods (Highlands) Craft Heraldy Enhanced Portals Geo Strata Lycanites Mobs Meteorcraft Mimicry MFFS Opis Reiminimap Since adding all these mods, the only ID conflict that i got was from pams harvestcraft for cinnamon. I changed that and havent had any issue with ID conflicts, i was told that Ars magica doesnt play well with rotarycraft but if i dont get a id conflict i would be fine. So im not sure whats giving me the specific issue with the crashing. Like i said the server works fine. The only thing that i know is when using Mystcraft going from the overworld to an age. I will crash 50% of the time. Even if its going to the nether using a linking book. I know this aint the support section, but it can take so long to get an answer sometimes. So my appogies ahead of time if it upsets someone. If this is no help then ill move it over to the support section.