Ok, so when I start MC with the new launcher, everything is OK, but when I minimise it, the window closes and this appears in the development console:
Client> # A fatal error has been detected by the Java Runtime Environment:
Client> # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000000000c9ee5f4, pid=8348, tid=10872
Client> # JRE version: 7.0_05-b05
Client> # Java VM: Java HotSpot(TM) 64-Bit Server VM (23.1-b03 mixed mode windows-amd64 compressed oops)
Client> # Problematic frame:
Client> # C [ig4icd64.dll+0x68e5f4] ShCompile+0x1311a4
Client> # Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
Client> # An error report file with more information is saved as:
Client> # C:\Users\Jack\AppData\Roaming\.minecraft\hs_err_pid8348.log
Client> # If you would like to submit a bug report, please visit:
Client> # http:Client> # The crash happened outside the Java Virtual Machine in native code.
Client> # See problematic frame for where to report the bug.
Client> AL lib: (EE) alc_cleanup: 1 device not closed
Game ended with bad state (exit code 1)
Couldn't delete C:\Users\Jack\AppData\Roaming\.minecraft\versions\1.6.1\1.6.1-natives-20178303893494 - scheduling for deletion upon exit.
Weirdly, if I have the minecraft open, but click another window, it's fine. This has only started happening using the new launcher, so I assume it's to do with the launcher.