No cursor visible in Web Client (IE11)

Recently noticed that using the Web Client (Webconnector) to access myTeamViewer 12 computer (Linux 32-bit) I cannot see the cursor. This is on IE11 / Windows 7. Previously, the cursor used to show as a fuzzy rectangular blob, but still worked. The session functions normally, with cursor interactions being perfromed - it's just that I can't see the cursor!

Using a normal client (e.g iPad app) the cursor is clearly visible and behaves normally.

Is there any way I can see the cursor using Web Client? I cannot install Teamviewer on this client PC and Webconnector is my only option.