Thanks @RomanZ - I really want to use this product so I definitely will when I can. I've had to disable it for now but as soon as I turn it back on I'll log a ticket.
Yes Yi WANG - I've thought this for a long time, most syncing solutions I have tried (Dropbox included) seem to have trouble with large numbers of files. My NAS has hundreds of thousands of tiny files which I think causes issues.
I know this is an old post but it's the top result in Google for "btsync indexing"
Has there been any update here - my 2TB(ish) NAS was stuck indexing for weeks so last week I replaced the disks and reinstalled and it's been stuck on indexing for 4 days now! I wouldn't mind put my CPU's are pegged at 100% so the box is pretty much unuseable while this is going on.