Happens to me too whilst browsing Synaptic PM packages. It is definitely not a Mint15-only issue. After reboots the problem reproduces itself. SynapticPM will run, I can enter my password, mess around a little and then will freeze every time on me.
Linux xxx 3.8.0-25-generic #37-Ubuntu SMP Thu Jun 6 20:47:07 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
Xubuntu 13.04
Happens to me too whilst browsing Synaptic PM packages. It is definitely not a Mint15-only issue. After reboots the problem reproduces itself. SynapticPM will run, I can enter my password, mess around a little and then will freeze every time on me.
Linux xxx 3.8.0-25-generic #37-Ubuntu SMP Thu Jun 6 20:47:07 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
Xubuntu 13.04
MSI Z77 Motherboard | i3-3220 | 8GB RAM