ok so what happened is almost certainly the following:
-you updated to NC 2.5 beta
-HM2 at some point prompted you to update and you did
Of course these are both perfectly reasonable things to do. What happened behind the scenes though is that the "newest" HM2 actually downgrades you to the stable NC version 2.4. This causes a problem since it uses a different database schema (other than scatter points which is why those still work).
Resetting/recreating notes in NC will recreate the database and your notes and will work again. I am not happy to inconvenience you like this but hopefully you can understand that with betas it is not that easy to avoid
How to reset NoteCaddy notes - Assaultware Wiki