I run Windows 7 64bit ( also happens on Windows Xp Pro
When i leave ftprush running for a long time and connected to a ftp site ftp rush locks up. When i go into task manager the process is using 50% - 100% of the cpu. Also when this is happen you can not bring up the ftprush windows you are only left with crashing the programing. Turning off the sfv checker seems to fix this a little bit, also making sure you dont leave any site connected for long period of time.
This issue only start when you released this new version.