Redownload it. Tried this morning and it starts as expected
I see a lot of people having the problem with the IDE 1.6.5-r2 not launching after successful install.
Windows 7.
This is my experience and resolution.
Specifically to the following errors:
java.lang.ArrayIndexOutOfBoundsException: 3
and
org.apache.commons.exec.ExecuteException: Process exited with an error: 1 (Exit value: 1)
1.6.5 IDE installs fine, splash screen, and then Nothing. Win7 Pro 64- Resolved
I am now up and running.
No drivers in this package? 
olex, of course there are the drivers. Why should we remove them?
Hi Federico,
Thanks so much for bringing the 'Open recent' entry in the File menu 
For the next release, any possibility to prevent opening a new IDE instance when selecting 'open recent' ??
Thanks again for your ongoing work
Kas, thank you for the compliments. As for your request, no, opening a sketch will keep on opening a new window, no matter if it's a new sketch, a sketch from your sketchbook or one or more from your recent sketches. Introducing different behaviours for similar functions makes both the code harder to maintain and the IDE more difficult to use
What will the IDE do if you open a sketch that was deleted? Will it crash or just pop up a error window?
[quote author=Federico Fissore date=1434379878 link=msg=2277027]
The list of available unofficial boards support urls has grown to 18 and library manager lists 229 different libraries.[/quote]
Hi Federico
Can you tell me what happens in this situation?
- Add an Additional Board Manager URL in Preferences
- Install that board in Boards Manager - this triggers a download which takes some time
- Remove that board in Boards Manager
- Install the same board in Boards Manager - this takes much less time than step 2.
Is Boards Manager reinstalling the same files from a cached copy somewhere? If so, does it check first to see if a newer version is available at the URL?
Thanks
Ray
Yes, files are saved into a "staging" folder. Those files have the version in their name (for example avr-1.6.2.tar.bz2 is the avr core version 1.6.2). No check is made for a "newer" avr-1.6.2. If a newer version is available, it is expected to have a different name. For example, latest avr core is in file avr-1.6.7.tar.bz2
Thanks, Federico.
hello
IDE 1.6.4 is occasionally fixed when I change sketch.
Hi Federico,
I tried to execute 1.6.5 of some hourly build(29,30/Jun, & latest).
But I've never seen good result yet.
The result ofarduino_debug.exe is below.
com.sun.jna.platform.win32.Win32Exception: The specified file does not exist.
at com.sun.jna.platform.win32.Advapi32Util.registryGetStringValue(Advapi32Util.java:580)
at com.sun.jna.platform.win32.Advapi32Util.registryGetStringValue(Advapi32Util.java:555)
at processing.app.windows.Platform.recoverDefaultSketchbookFolder(Platform.java:65)
at processing.app.windows.Platform.init(Platform.java:56)
at processing.app.Base.guardedMain(Base.java:154)
at processing.app.Base.main(Base.java:138)
1.6.0 & 1.6.4 is OK.
Thanks,
gmacky, it looks like your windows registry is missing an entry
Are confortable with regedit? Can you look for entry
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders and look for key "Personal" ?
What windows are you using? is it a local account or network account? What's the path of your Documents folder?
Hi Federico
In 1.0.5, three left clicks used to select a complete line, including the ending
not anymore in 1.6.5
Can you bring back this precious editing feature ??
I have nice thoughts about you each time I access my working sketch through 'Open Recent'
and not so nice thoughts each time I have to kill this stupid empty IDE window 
kas:
Hi FedericoIn 1.0.5, three left clicks used to select a complete line, including the ending
not anymore in 1.6.5Can you bring back this precious editing feature ??
Yeah Federico, we want it back !!!!!!!!!!!!!!!!!!!!!!!!!
Working on it
Issue tracked at Editor: triple click should select whole line · Issue #3469 · arduino/Arduino · GitHub
Fixed since next hourly build http://www.arduino.cc/en/Main/Software#hourly
Thank's a lot for that 
Super fast move
Thanks Federico