1.7.10 is not an official build, it's from the rogue "arduino.org" people - they forked the IDE and bumped the version to deceive people into thinking that they are the latest official versions. There is ongoing litigation regarding their unauthorized use of the Arduino trademark. As such, you should contact them with bug reports if you wish to use their version.
The latest official version is 1.6.11. Good recent versions are 1.6.5r5, 1.6.9, and 1.6.11
You can download official versions of the IDE from the download page: