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Okay I'm going to suggest a few things to do. These should help the error, and should help with performance and such. You have windows so you want Java 7. You have 64bit windows so you want the 64bit version of Java. You also appear to have your launcher in your AppData folders, where minecraft...

Its not just you. I checked myself and another website that checks whether a website is down and it said minecraftforge.net is down. Did you need help or just verification that the site was down?

Please post your console log in debug mode to pastebin.com and link it here. Here is a guide explaining how to do it.

It depends on your OS. In windows XP you right click on your My Computer icon on the desktop and choose properties. In Win7/vista you need to click on the start button, or windows logo now, and then right click on the word computer and choose properties. Both will bring up a box that shows you...

Go to the options tab and from there you can change the amount of RAM you have allocated to FTB. The only restriction on allocating RAM that I know of is if you have 32bit version of Java you can only allocate 1GB of RAM. Be sure to leave about 2GB for Windows though.

Since your world is new and not that developed this is what I suggest. If you do want to keep your save then back it up somewhere outside the FTB folder until you have done this. Delete everything FTB, Minecraft, and Java related off your computer. This will ensure that a previous install is not...

When did you notice the lag? Is this an existing world or a new world? Fresh FTB install? Single Player or Server? These suggestions might help. Also a console log in debug mode pasted to pastebin.com might help us find a cause. Look here for the guide to get it. If you are up for it you might...

I'm glad you got it to work. Sorry I could not have been more help.

From your log: After doing some searching the 503 error means minecraft's login servers are/were down. You can still play offline. Sorry I'm no expert like I said. This is what I understand from reading what I've read online about this error.

I do not play much MP so I did not know this until now. Apparently the 503 error means that:

For all but the initial release of the pack you will find the version numbers to the modpacks here. Each time a modpack is updated a new post is made in the thread. Each mod that is updated and the version it is updated to is given in these threads.

I would backup your saves and force update then. Go to the options tab and select the big button that says 'Force Update?'. This will give you a fresh install of the modpack. Once that is up and running we can help you try and install Natura and Flans if you still want them. I know how to help...

Mindcrack is not updated to 1.5 yet. Even version 8.3.0 is still 1.4.7. I'm not sure where you got the info that version 8.3.0 is for 1.5.2. At the moment if you see any servers running 1.5.1 or 1.5.2 they will not be an FTB server. If you want to join those servers you will need to install the...

Could you give us the console log in debug mode and the error log. Copy them to pastebin and link them here. This guide will explain how to get them. Did you update modular power suits? Did you add or update any other mods to the pack?

Could be bootcamp, but I agree if you have windows you want Java version 7. Only if you are using MacOS do you want Java version 6. Follow this step-by-step guide for installing the loader and Java. You want it in its own folder not in your downloads folder.

For the 1GB limit it is caused by using Java 32bit. You will want to remove all versions of Java from your computer and install the 64bit version of Java 7 update 21. This guide will help with that. For the crash we need your logs. Update your java and then follow this guide. Paste your...

That profile 'thingy' is your minecraft username and password. You must be a premium minecraft user.

Please update your java to 7 update 21. Follow this step-by-step guide to do that and eliminate possible user error with installation. Once done please follow this guide to get your console log in debug mode. Paste it to pastebin and link here. Finally a little info on what is wrong with your...

Did you add XyCraft to your YogCraft modpack? If so the cause was from you searching for XyCraft items. To fix it you will need to delete the NEI.dat file located here. ...\modpackname\minecraft\saves\NEI\local\New World\NEI.dat You can learn more about the bug here. If this does not fix...

Get your error logs from here. Copy them to pastebin and link them here.