Formula Fields Not Updating

Formula Fields Not Updating

I use a lot of formula fields for simple things like displaying full names of a contact or creating a URL link to a details HTML page.

Quite often the formula result does not update or gets somehow corrupted... This has been happening for a long time but I'm only now getting around to reporting the issue...

Simple example.

'Admin' Application, 'Contact' Form, 'NameEmail' field has formula = First_Name + " " + Last_Name + " - " + Email

Right now, the majority of my contacts are displaying first and last name and then a null email despite the fact that email is a mandatory field and there are no nulls! e.g. "John Smith - null"... This used to work fine.

Why is this occurring?

If I edit the contact and save (without actually making any changes) - the formula field is updated & John Smith's email changes from null to his correct address... Sometimes if I edit the formula field itself, it will also fix the issue, but Its obvious something is wrong...

My application is fairly reliant on these formula fields being up to date!

Can anyone help with this??

Thanks
Todd