Is there a way to enable verbose logging/debugging?

Hi gregg.thomason. Sorry for the trouble! The event and exception logs should ideally contain details. What kinds of issues are you facing? And can you please include the full version of 9 and 10?

it's to 10.2.4296; start was 9.2.something. 

The list of broken is considerable. For example, login no longer forwards from /login?ReturnUrl=%2F to our SSO login. I have tried the build at https://github.com/Telligent/SAML/ as well as our own. Page rendering is extremely broken but i assume that's part of the overall changes. 

Neither of these should be expected. 10.2 does introduce many theming changes, but previous themes should be fully retained and usable with the ability to opt into changes, not unlike other UI upgrades. If it's too much to get into on a public thread, I'd recommend opening a support ticket.

I have just come across an issue with Themes, I am in contact with support.

Do you have access to your database?