If SmartSVN crashes at start time with something with an error related to“ Java fatal error” and a “problematic frame” in the terminal, you may try this workaround.
In your home directory, edit the .bashrc file and add a line at the bottom.
cd gedit .bashrc
# fc-25.3.2014 SmartSVN does not start (Java problematic frame) GTK_MODULES=""
Then restart your computer.