Empty XBMC Repositories with Android

Hardware: Mk808
Os: Android ICS
Notes: running XBMC (Frodo) with external Player (mxplayer)

Some of the third party repositories available are coming up empty.
Once installed via Fusion or manually, the addons that should be located in the repositories are not there.
The repositories seem to be completely empty.
This is not the case with all available repositories. Some work perfectly.

I have tried a fresh install but this did not work
I have tried deleting the DB file, this did not work.

Why are some repositories installed properly and others are not? What is different about those that are coming empty?
Is it possible to find third party addons outside of repositories? Maybe installing them as a single file may work.

Any help with this would be great,

Thanks

G.F