v9.1 is available:
- Improved pool-related routines: less disconnects, more hashrate on some pools.
- Fixed issue with some old 6xxx/5xxx cards ("lowDifficultShare" error).
9.1 gets flagged as malware in google chrome, have you added some dlls which could cause this?
I tried it and confirmed that Chrome does not want to download all versions, even v7. It's really paranoid filter, I have no idea why it decided to block files. I remember it worked in past...