Unable to draw a shape other than a rectangle

[tosca]

I just realized I couldn't draw any shape but a rectangle. When I try to select another shape, the program doesn't seem to register my choice, and whatever I try to draw on the page afterwards is always a rectangle.
Someone on the Linuxgraphic forum suggested this could be related to a configuration file issue, but the problem remains even after I removed my user configuration files.

Any idea how I could solve this?
I'm currently running 1.4.3 on a Fedora 20 system.

Thanks for your answers.