Hello!
I can't get arduino IDE to work. Each time I try to start it I get "launch4j" error. IDE does not open, and haven't been working since i've downloaded it. I tried reinstalling java and using patched pde.jar and rxtxserial.dll. Deleting preferences doesn't work either, as I haven't even started IDE yet 
According to troubleshooting guide I should open run.bat, but I can't find it anywhere (downloaded IDE twice, still nothing). Any help is much appreciated.
sskeleton:
Hello!I can't get arduino IDE to work. Each time I try to start it I get "launch4j" error. IDE does not open, and haven't been working since i've downloaded it. I tried reinstalling java and using patched pde.jar and rxtxserial.dll. Deleting preferences doesn't work either, as I haven't even started IDE yet
What platform?
Assuming some sort of Windows, try launching it from the command line:
arduino --l4j-debug
This will create a launch4j.log file in the same directory. See what that says.
Problem solved!
All I had to do was to change
editor.languages.current=
to
editor.languages.current=en
in preferences.txt 