So I installed Minecraft launcher 1.6.11 but when I choose my 1.7.2 forge profile then click 'play', it starts loading then just disappears and nothing comes up at all. It does load 1.8.1 no probs. I still have the old launcher (which loads perfectly), would that be causing me issues? Bit stuck for ideas, any help would be greatly appreciated. This is all that comes up in Launcher log:
[17:01:13 INFO]: Minecraft Launcher 1.6.11 (through bootstrap 100) started on windows...
[17:01:13 INFO]: Current time is Feb 8, 2015 5:01:13 PM
[17:01:13 INFO]: System.getProperty('os.name') == 'Windows 7'
[17:01:13 INFO]: System.getProperty('os.version') == '6.1'
[17:01:13 INFO]: System.getProperty('os.arch') == 'amd64'
[17:01:13 INFO]: System.getProperty('java.version') == '1.8.0_25'
[17:01:13 INFO]: System.getProperty('java.vendor') == 'Oracle Corporation'
[17:01:13 INFO]: System.getProperty('sun.arch.data.model') == '64'
[17:01:13 INFO]: proxy == DIRECT
[17:01:13 INFO]: JFX is already initialized
[17:01:13 INFO]: Refreshing local version list...
[17:01:14 INFO]: Refreshing remote version list...
[17:01:16 INFO]: Refresh complete.
[17:01:16 INFO]: Loaded 11 profile(s); selected '1.7.2 '
[17:01:16 INFO]: Refreshing auth...
[17:01:16 INFO]: Logging in with access token
[17:01:13 INFO]: Minecraft Launcher 1.6.11 (through bootstrap 100) started on windows...
[17:01:13 INFO]: Current time is Feb 8, 2015 5:01:13 PM
[17:01:13 INFO]: System.getProperty('os.name') == 'Windows 7'
[17:01:13 INFO]: System.getProperty('os.version') == '6.1'
[17:01:13 INFO]: System.getProperty('os.arch') == 'amd64'
[17:01:13 INFO]: System.getProperty('java.version') == '1.8.0_25'
[17:01:13 INFO]: System.getProperty('java.vendor') == 'Oracle Corporation'
[17:01:13 INFO]: System.getProperty('sun.arch.data.model') == '64'
[17:01:13 INFO]: proxy == DIRECT
[17:01:13 INFO]: JFX is already initialized
[17:01:13 INFO]: Refreshing local version list...
[17:01:14 INFO]: Refreshing remote version list...
[17:01:16 INFO]: Refresh complete.
[17:01:16 INFO]: Loaded 11 profile(s); selected '1.7.2 '
[17:01:16 INFO]: Refreshing auth...
[17:01:16 INFO]: Logging in with access token
Just a few!