I'm going to guess your SQLMembershipProvider entry has changed - it looks like you changed the PasswordFormat from Hashed to Encrypted. If you want to use encrypted I believe there are a few other things you'll have to configure. Here's a thread that
Here's my SQLMembershipProvider entry that works fine for me:
<add name="FBAMembershipProvider" type="System.Web.Security.SqlMembershipProvider, System.Web, Version=220.127.116.11, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" applicationName="/" connectionStringName="FBADB"
enablePasswordReset="true" enablePasswordRetrieval="false" passwordFormat="Hashed" requiresQuestionAndAnswer="false" requiresUniqueEmail="true" />