I can't manage users in FBA Management after server restore

SharePoint FBA Pack
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1
Hi,

I am not able to edit users in FBA User Management. I can see full list of my users and I can create new users that I am able to edit but when I try to edit users created before we restored our server I receive following error message:
"Object reference not set to an instance of an object."
All settings seems to be as they should, authentication provider in Central Administration, type of authentication in IIS and Connection String and Provider.
2
Is there any more to the error message - like what function/line number the failure occurred at? If not, please check the SharePoint log file, I expect there will be more info in there.

Are you using the standard SQL Membership Provider?
3
Hi Ccoulson,

This is output form Logs:

Timestamp Process TID Area Category EventID Level Message Correlation
05/13/2014 15:11:42.35 CKS.FormsBasedAuthentication, V (0x0318) 0x18F0 InternetExtranetEdition System.NullReferenceException 0 Critical Object reference not set to an instance of an object. at CKS.FormsBasedAuthentication.UserEdit.OnLoad(EventArgs e) 8c2bb7f9-e3ae-4b4b-ad91-87735046b98f
05/13/2014 15:25:40.56 CKS.FormsBasedAuthentication, V (0x0318) 0x18F0 InternetExtranetEdition System.NullReferenceException 0 Critical Object reference not set to an instance of an object. at CKS.FormsBasedAuthentication.UserEdit.OnLoad(EventArgs e) 613432cd-a47b-4c7e-970b-d1822fc2ac74
05/13/2014 15:25:52.38 CKS.FormsBasedAuthentication, V (0x0318) 0x18F0 InternetExtranetEdition System.NullReferenceException 0 Critical Object reference not set to an instance of an object. at CKS.FormsBasedAuthentication.UserEdit.OnLoad(EventArgs e) 61e6ef77-6888-4a03-9538-1b41dbd37f49
05/13/2014 15:28:36.86 CKS.FormsBasedAuthentication, V (0x0318) 0x18F0 InternetExtranetEdition System.NullReferenceException 0 Critical Object reference not set to an instance of an object. at CKS.FormsBasedAuthentication.UserEdit.OnLoad(EventArgs e) d84e5ef8-bf40-4187-8f79-ab6db74c9470

I am not using standard SQL Membership Provider, we have specified database for our users,
Also I noticed that some of old users work, it seems to be random, but majority is not accessible.

Thank you!
4
It looks like you're not actually using the FBA Pack. The error lists:

CKS.FormsBasedAuthentication

For the FBA Pack it would be:

Visigo.Sharepoint.FormsBasedAuthentication

Are you using SharePoint 2010 or 2007? CKS is the 2007 solution that the FBA Pack was based on.
5
Yes that is right, I am sorry for my mistake, I am using SharePoint 2007 WSS 3.0