Annoying Cursor in Eclipse Kepler

问题

I have eclipse kepler on Ubuntu 13.04 which has Dark Juno theme and solarized color theme for the editor. It didn't have any problem until recently wherein whenever I'm typing the typing cursor seems to have this black trail that goes with it and covers like 5-6 characters. It also occurs when I'm trying to go into lines of code using mouse or keyboard. It doesn't seem to be the smart insert mode which I've tried turning off and didn't have any effect. Sometimes the typing cursor becomes 2 and I don't have a clue why that happens.

some screenshots(I'm linking cause I don't have enough reputation to post images):

http://s23.postimg.org/586jmlsxm/Screenshot_from_2013_10_29_14_15_41.jpg

http://s23.postimg.org/pprhy9513/Selection_006.png

EDIT: I've tried reverting to default theme, reverting to text editor default color theme(turned the thing that blocks the text into white), restarting eclipse, and restarting the laptop itself. Nothing worked.

EDIT: Upon testing creating new projects in C, C++, and java, I found out that the input was fine but with android projects this problem occurs.