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It is not recommended because it clashes with many forge mods.
If you really must use it then try the link below for help getting it to work. But if you crash the first thing people will say is to remove it and try again...
The ftb launcher is not currently supporting java 8 so stick with latest java 7.
Can you post the crash log from the link below please.
C:\Users\Hugo\Desktop\Jogos\Feed The Beast Minecraft\Unleashed\minecraft\crash-reports\crash-2014-02-22_17.40.53-client.txt
Try adding the information below to the java additional paramters box in advanced options in the launcher. Just copy and paste the text into the box.
-Djava.net.preferIPv4Stack=true
Also make sure that your av/firewall is not blocking java or the launcher.
Please post the crash log to pastebin see the error. Try the link below to recover the world.
http://forum.feed-the-beast.com/threads/direwolf20-1-6-4-1-0-14-world-dissapeared.40499/#post-551684
Can you post the crash log to pastebin then link it here to see what mod is causing the issue. The link below will help you get the world back.
http://forum.feed-the-beast.com/threads/direwolf20-1-6-4-1-0-14-world-dissapeared.40499/#post-551684
Are the monitors still showing that they are on i.e green light or whatever. What happens if you press ctrl + alt and delete does anything appear on screen.
I will be sad to see this forum go as I prefer here to the new one. I will just have to get used to it i suppose.
I don't see many of the usual helpers like myself there as of yet.
If the people that are running vista and upwards built their own systems then chances are that they will be using 64 bit systems but could be 32 bit. But if they are shop bought e.g Dell, HP with 4gb of ram or less then they will be most likely 32 bit but it is worth getting them to check.
I...
In simple terms the 1.6.4 packs require a 64 bit os because they require a 64 bit java. Using a 32 bit os limits the amount of ram available to the launcher to 1.5gb. The new packs require a miniumu of 2gb to run.
While it maybe possible to go back to 1.5.2 I would not recommend it because the...
Please create a new thread and post your log in the correct format as described in the link below.
http://forum.feed-the-beast.com/threads/your-logs-and-you-what-you-need-to-know.36509/