I have just updated to version 2.9.0 and the tex files that used to work fine are now not working when I click 'Build and View' I am getting this strange error: 'Error: One command expansion invalid.'
Downgraded back to version 2.8.8 and it works fine.
I am using Windows 7.
what jus set for "build and view" in your options ?
Please try with a new version from here:
https://sourceforge.net/projects/texstudio/files/texstudio/TeXstudio%202.9.4/
Last edit: Tim Hoffmann 2015-03-30
no feedback