Pinta-1.5-preview-20130512 on Windows XP (this is a problem I had for ages, so not a regression, but always forgot to report a problem).
1. Select Text tool and click on canvas.
2. Now lets say that you don't want to type text on exact the same location you have clicked and you would like to type text in some other location. So you click on another location and nothing happens, mouse cursor is still at first position clicked (step 1).
The work-around is to press <ESC> key and then you can click on another position - little bit annoying and not really user friendly specially for new Pinta users.
I tested the following programs and they don't have this kind of problem:
1. Microsoft Paint on Windows XP.
2. Paint.NET 3.5.10 on Windows XP.
3. Gimp 2.8.4 on Windows XP.
This problem still appears in Pinta 1.6 daily PPA on Ubuntu 14.04. It is pretty annoying to click <ESC> key every time I would like to click on another location. For non-geek users this could be big problem, because they don't know that <ESC> is supposed to be pressed.