What version of AE are you using (down to the last decimal point)?
What are your system specs?
I'm using the last update for CC 2014. Sorry, I don't know where to find the exact name version.
I'm on a PC, windows 7 64bits, 32 Gigas of RAM and a GTX 750 Ti NVIDIA graphic card.
Help>About will tell you. It will start with 13 (for example 126.96.36.199)
I'm using the last update for CC 2014
No you aren't.
CC 2014.1 (AE version 13.1.x) introduced a blue color to the interface. Yours shows the old, yellow version. But it's not just one update, you are two updates behind! The latest version of CC 2014 is CC 2014.2 (AE version 13.2.x)
Seriously, you are missing a lot of bug fixes and a few new features too!
Although, technically, you're at least three updates behind since CC 2015 is now out! (AE version 13.5.x)
Also, in less than a week, the first update to CC 2015 is about to come out that fixes most of the known issues: known issues in After Effects CC 2015 (13.5) | After Effects region of interest