On Web Client when typing in the CSR field to open it and press Enter key nothing happens. This applies to all browsers. When a CSR is in the pre-filled drop down list and you select it, it will open. This happens only while trying to open a CSR that's not in the pre-filled list.
Since Stat 6.0 the routine to Find/Open a CSR from the Web Client is broken. So, instead of type Enter key you have to press the SPACE bar.
This behavor is changed and documented since Stat 6.0 in the Stat Web User Guide | Finding CSRs, pag.11