I have just updated my 7130G to OS 4.3.

All good except I now cant load any new downloaded themes via desktop manager.

Any ideas?

Welcome to the forums!

A couple of questions:

Are the themes designed for your model? Themes are model-specific, although many are made in versions for several models.

Are the theme files in .alx or .jad format? .jad is designed to be downloaded to your device via over-the-air, rather than using Desktop Manager.