A solution was developed and working. Deployed to client. Now it runs on client, but when we try to open it on developer, it hangs. After the solution is selected from the list, the Servoy logo appears and spins and just hangs there. While it is hung, we can still access it from the client without a problem.
On which version of Servoy are you running?, could you check the .log.txt file in your Developer directory for any errors?
Did you deploy it to a server? Or are you talking about clients connection the the developer (that now hangs?)
If you are deploying to a server, is the server connection to the same databases as the developer? If so which database do you use?