Let's narrow down the issue. Can you open up stand-alone Spaceclaim (SCDM 18.2) ?
If so, this is a configuration issue between Workbench and SpaceClaim, most likely with Windows registry.
If not, this is very likely a graphics issue. Type 'dxdiag' (without quote) in your Windows search or in CMD Prompt , then enter. This will bring up the DirectX Diagnostic Tool, wait until it finishes loading then click on all 'Display #' tabs (depending on how many monitors you are using) and take screenshot of each of this 'Display #' tab and post them here.
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