Linux Crashes (4.6/4.7)

Sorry for the delay! Been busy…

Distro: Ubuntu 14.10 64bit.
NVidia: GeForce GTX 660M
RAM: 8GB
Processor: Intel i7 (3rd Gen) 2.30ghz

Open a Project, click the Second Icon on the Left (looks like a PaintBrush) and it crashes, everytime.

Assertion failed: IsThreadSafeForSlateRendering() [File:Runtime/SlateCore/Public/Application/SlateApplicationBase.h] [Line: 306] 

Signal 11 caught.
[2015.01.17-04.18.04:659][231]LogLinux:Error: appError called: Assertion failed: Assertion failed: IsThreadSafeForSlateRendering() [File:Runtime/SlateCore/Public/Application/SlateApplicationBase.h] [Line: 306] 


EngineCrashHandler: Signal=11
[2015.01.17-04.18.04:838][241]LogCrashTracker: 


[2015.01.17-04.18.04:838][241]LogLinux: === Critical error: ===
Unhandled Exception: SIGSEGV: invalid attempt to access memory at address 0x00000003

[2015.01.17-04.18.04:838][241]LogLinux: Assertion failed: Assertion failed: IsThreadSafeForSlateRendering() [File:Runtime/SlateCore/Public/Application/SlateApplicationBase.h] [Line: 306] 



[Callstack]  02  0x00007fe7d85183e5  ReportCrash(FLinuxCrashContext const&)
[Callstack]  03  0x0000000000424de0  EngineCrashHandler(FGenericCrashContext const&)
[Callstack]  04  0x00007fe7d851af1b  PlatformCrashHandler(int, siginfo_t*, void*)
[Callstack]  05  0x00007fe7d8f3ec90  /lib/x86_64-linux-gnu/libpthread.so.0(+0xfc90) [0x7fe7d8f3ec90]
[Callstack]  06  0x00007fe7d8523bb7  FOutputDeviceLinuxError::Serialize(wchar_t const*, ELogVerbosity::Type, FName const&)
[Callstack]  07  0x00007fe7d85b213c  FOutputDevice::Logf(wchar_t const*, ...)
[Callstack]  08  0x00007fe7d859e852  FDebug::AssertFailed(char const*, char const*, int, wchar_t const*, ...)
[Callstack]  09  0x00007fe7d245aaab  SWindow::GetCurrentWindowZone(FVector2D)
[Callstack]  10  0x00007fe7d29556c9  FSlateApplication::GetWindowZoneForPoint(TSharedRef<FGeneri[2015.01.17-04.18.04:838][241]LogExit: Executing StaticShutdownAfterError
Starting ../../../engine/binaries/linux/crashreportclient