Windows .exe Direwolf20 crasching after long wait and mojang screen

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Try to upload a new log. Might be something else happening now.
its not, i missed it earlier...

heres the problem (on line 97 of your first log):
Code:
JVM Flags: 4 total; -Xms256M -Xmx1024M -XX:PermSize=256m -Xmx512M
and line 97 of the second:
Code:
 JVM Flags: 4 total; -Xms256M -Xmx4096M -XX:PermSize=256m -Xmx512M

the launcher is trying to start the game with a reserved memory space of 256 MB (-Xms256M) and a maximum of 1GB (-Xmx1024M) or 4GB (-Xmx4096M) which is usually all it does by default. you've specified "-XX:PermSize=256m -Xmx512M" as extra parameters in the "additional Java parameters" section of the advanced settings and so the second max memory space parameter (-Xmx512M) is overriding the first one. hence why changing the MAX RAM in the launcher is making no difference.

fix it by going to the settings tab of the launcher, click "advanced options" and then just clear the "additional Java parameters" box and use the reccomended perameters found here
 
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I might be reading the logs wrong, but max memory size seems to be set to 476MB which is too low to run the DW20 pack. Are you sure you changed the slider is the launcher options?

Edit: Aah JamiePhonic already figured it out for you :)
 
its not, i missed it earlier...

heres the problem (on line 97 of your first log):
Code:
JVM Flags: 4 total; -Xms256M -Xmx1024M -XX:PermSize=256m -Xmx512M
and line 97 of the second:
Code:
 JVM Flags: 4 total; -Xms256M -Xmx4096M -XX:PermSize=256m -Xmx512M

the launcher is trying to start the game with a reserved memory space of 256 MB (-Xms256M) and a maximum of 1GB (-Xmx1024M) or 4GB (-Xmx4096M) which is usually all it does by default. you've specified "-XX:PermSize=256m -Xmx512M" as extra parameters in the "additional Java parameters" section of the advanced settings and so the second max memory space parameter (-Xmx512M) is overriding the first one. hence why changing the MAX RAM in the launcher is making no difference.

fix it by going to the settings tab of the launcher, click "advanced options" and then just clear the "additional Java parameters" box and use the reccomended perameters found here
Now minecraft doesnt even open at all... The console says: http://pastebin.com/fP1ETXR2
 
fix it by going to the settings tab of the launcher, click "advanced options" and then just clear the "additional Java parameters" box and ONLY use the recommended parameters found here Pasted below AFTER you get it to launch with the box cleared

Code:
-Xms1024m -XX:PermSize=256m -XX:NewRatio=3 -XX:SurvivorRatio=3 -XX:TargetSurvivorRatio=80 -XX:MaxTenuringThreshold=8 -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:MaxGCPauseMillis=10 -XX:GCPauseIntervalMillis=50 -XX:MaxGCMinorPauseMillis=7 -XX:+ExplicitGCInvokesConcurrent -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=60 -XX:+BindGCTaskThreadsToCPUs -Xnoclassgc