Version 2.6.6 on MacOS 10.9.
Editor scrolls up to the top of the document without any mouse or keyboard interaction. Editing is impossible so I reverted to a previous version.
When does it happen (immediately at startup, after a certain time, randomly, permanently ...) ?
I had the same problem as well and it is on startup that this occurs. I quit using it so I don't know if it is permanent or if it goes away after a few minutes.
I could reproduce it with 10.8.5 and the Qt5-based build. A Qt4.8.5 build was ok. (But that isn't a solution for OSX 10.9 because of Another Qt bug
for osx <= 10.8 , you can use
I have the same problem. The tex scrolls down for a second or two and then snaps back to the top of the document. The behavior is consistent even if the cursor is off the screen.
New build: http://sourceforge.net/projects/texstudio/files/texstudio/TeXstudio%202.6.6/texstudio_2.6.6c_osx_qt5.dmg/download