Changes in 3.6.10 templates to 3.7?

[Mark.B]

Really, you need to start over ideally.

However, it has to be said that I managed not to.....in my customized templates I found it easier to edit the 3.7 changes in manually. But you need to do a template comparison to do that effectively, it can be messy.

If you can, start afresh, but keep a copy of your old template changes and try to mix them in afterwards.