gtk3 segmentation fault when changing back to previous timeline

[Jesse Johnson]

When changing timelines using the gtk3 inteface, if I try to switch back to a previously viewed timeline I experience a segmentation fault. I can reproduce this easily.

Neither the gtk2 nor qt interfaces suffer this bug.

I am running the latest Hotot from github in Ubuntu 14.04 alpha with no problems in any other applications.

Please let me know if you require debugging information and how I can best obtain it.