Backup issue with change tracking future on

Hi,

I found that lot off people has this backup issue with change tracking future on. We applied Microsoft fix but error still remains. We get messages:

Failed to flush the commit table to disk in dbid 5 due to error 2601. Check the errorlog for more information.

Cannot insert duplicate key row in object 'sys.syscommittab' with unique index 'si_xdes_id'.

We would like to disable and enable change tracking but we dont want lose change tracking information. I have 2 questions:

1. Is it any way to save change tracking information to safely reenable change tracking on database?

2. Is it posible to delete table 'sys.syscommittab' to solve this problem? Or is there any other solution?

Thanks