there was a regression caused by updates to JAVA that appears to have possibly broken OC in previous versions. Truth is we were likely misusing a nonblocking file handle, and we were vulnerable to this issue for a long time. But with recent java updates, this issue is causing this serious bug that you have encountered.
We have patched our official release of OC to deal with this. You will need to do one of the follow
1. disable bufferChanges in the oc settings. you said you did this, this is actually how to protect yourself from the bug. I suspect you actually hit the bug when buffer