Can't click any button on the UI of android studio

Question

I used to install Android Studio on Ubuntu14.04 and it worded well. Now I install it on Ubuntu12.04 but have a strange problem. Sometimes when I run it, it seems fine, but I can't click any buttons on it. I can use the mouse to highlight the button, but I can't click on it to make some action. Like open the SDK manager, create a New Project, etc. The only way I can is to use the "ENTER" button to take the place of left click. It's very weird and inconvenient.

Does any one have an idea about it? Thank you very much!

===============================================================

Now it again becomes out of control. In the terminal it shows: In the terminal it shows:

Received result DaemonCommandResult[type=Success, value=org.gradle.tooling.internal.provider.BuildActionResult@3ce49329] from daemon DaemonInfo{pid=3808, address=[b7a9bbfd-4a65-4ef0-9dce-d6afb9d0f860 port:34032, addresses:[/0:0:0:0:0:0:0:1%1, /127.0.0.1]], idle=true, context=DefaultDaemonContext[uid=3585f0de-2fbe-4575-a856-bca78b93ea4b,javaHome=/usr/local/java/jdk1.7.0_75,daemonRegistryDir=/home/faye/.gradle/daemon,pid=3808,idleTimeout=10800000,daemonOpts=-XX:MaxPermSize=256m,-XX:+HeapDumpOnOutOfMemoryError,-Xmx1024m,-Dfile.encoding=UTF-8,-Duser.country=US,-Duser.language=en,-Duser.variant]}.

Answer 1

I haven't conclusively proved this yet, but my theory is Android Studio breaks if you ever have more than one pointing device attached (not sure if Android Studio has to be open while they're both attached).

Yesterday, I swapped mice (unplugging the old and then plugging in the new). Android Studio was fine. Today, I plugged in the old and then unplugged the new. That's when I noticed the described behavior. No amount of unplugging, re-plugging, or restarting Android Studio helped. I restarted the machine with both mice attached and it was still broken.

Strangely, it even affected the Beta version of Android Studio that wasn't even open while all of this was happening. I even installed an update to the Beta version (using the keyboard); still no mouse clicks.

I finally restarted my machine with only one mouse attached. Android Studio is back to normal.