I uploaded v2.1 to my MEGA folder, see original post for the link.
What's new:
1. Added "-hc" option to improve stability for some cards/systems.
2. Added "-ss 2" option to reduce CPU usage even more.
3. Changed GUI: now with "s" key you can select minimal/detailed statistics.
4. Added estimated and average CPD (chains per day) values.
cpu usage with -ss 2 now lowered to 40% on my 5x280x rigs with pentium haswell(about 7% per instance), and gpu usage up to 95%+-. great work