BT sync on android is completely broken as of Android 4.4, as the permissions needed to access the SD card have changed. As a result any sync folders on the SD card (aka all of them) can't be accessed. Surely this bug is known, but it should be so easy to fix that one would expect a new release solving the problem to have already been available.
Topic pretty much says it all. The btsync "folders" tab shows file count and size for each folder ("39.0 GB in 17783 files"). Simply add another column showing the .SyncArchive contents (0 B in 0 files) to the same tab.