1.8 now locks up my system every time sibcoin miner starts. I don't have this problem with any other miner. What's worse, it seems to corrupt memory and requires a complete power off (not just a reboot) or half my GPU's don't get recognized afterwards.
Sorry for that.
Would really help if you could do the following:
1. Turn on "enable debug log" in the settings, wait for this to happen again (to try and reproduce this quicker you may want to choose to mine only that coin) and after system restart send us the log files. We will quickly take a look and get back to you.
2. As an interim solution - you may want to turn off either the SIB coin or the Lyra2v2 algo.
Again, sorry for the inconvenience..