retsync plugin makes IDA hang when closing IDA #99

This error has been around for a long time and is very annoying, causing IDA to hang.
Open an IDA database file, work with it, then close it while still not exiting IDA
Then open another IDA database file, work with it, close it, then exit IDA.
IDA won't close the following database file and hangs.
I checked and there is a thread in IDA plugin still waiting.
Tks