Folders Missing from Sync Preferences

Greetings,

I'm using Zoho Docs for Linux 1.8.12. In the preferences dialog under Choose Folders, there are a number of sub-folders missing. The folders were there previously (I used Sync to upload the folders and files to Zoho Docs), and are visible in the web client. But now they're missing from the preferences dialog. I suspect a config issue, but I don't know enough about Sync to go mucking about in the config files (they're .dat files anyway, so...).

On a side note, there is an awful lot of data in the .cache folder. How does one go about flushing this cache? Those files are taking up a lot of space on the hard drive.

Any help with these issues if greatly appreciated.

FWIW, my system:

OS: KDE Neon 5.11 64bit

Kernel: 4.10.0-42-generic

Quad core i5-2520M CPU

8 GiB Ram

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