It looks like your database connectivity is messed up with the IP change.
Depending on what version of WF/SD you're on, the connection string may/may not be encrypted. Open up the web.config for ProcessManager and search for the previous IP... then replace with the current IP if the connection string instance is not encrypted.
If it is encrypted, you can use the command line utility to write the new connection string ginstance. The syntax is:
lbutil.exe -updatepmconnection -connectionstring "<mynewconnectionstring>"
NOTE: I would backu up the current web.config you have before making any changes.