On both my localhost and stage environments, applying the 4.4.9 patch that appeared today seems to have broken pages (with too many redirects and an inability to generate furls).

Anyone else experiencing this before I go mad with a week of ticket?

28 minutes ago, Paul E. said:

On both my localhost and stage environments, applying the 4.4.9 patch that appeared today seems to have broken pages (with too many redirects and an inability to generate furls).

Anyone else experiencing this before I go mad with a week of ticket?

For others happening upon this, even though there's no prompt to do so, visiting admin/upgrade after copying over the patch files and running the upgrader fixed the issue.

To be clear, this was already after upgrading from 4.4.8 to 4.4.9 and running the upgrader. There was then a prompt in the support tool that an additional patch was available that modified a handful of files.

While this fixed things on localhost, it did not on stage. Still exploring.

That's really strange. The patch wouldn't apply anything what would require to run the upgrader. Are you sure that you were running 4.4.9 and that not the 4.4.9 files were present, while the upgrader wasn't run? 

Positive.

Fixing it on stage involved disabling and reenabling the single plugin I have. It looks like it regenerated the file plugins/hooks.php.

Oddest thing.