It is absolutely correct the first answer given to upgrade to the latest version of Smart Client, 2.2 RevC RU2, is the best first step, you should also ensure that all prerequisites have been installed on ALL the nodes, SC Server, SC 800xA Data Provider node, and all Clients. This is to include the installation of .Net 3.5 & .Net 4.x Microsoft packages. Both of these are required in all nodes. According to the screen shots provided, it appears that you have installed both the Smart Client Server and Smart Client 800xA Data Provider software on the same node, which is perfectly acceptable. In this situation, make sure that the software is installed in a node that meats the requirements for the SC Server, (Windows version).