A potential cause is that your video card driver may not be compatible and needs to be updated. Please see the following help article for more information:
How do I fix blank screens during activation or in-product purchases in TurboTax Desktop for Windows...
For additional troubleshooting options, please see Troubleshoot blank screens, missing buttons, or missing images
There is also a fix provided by user miklk99 that some have had success with, you can view that thread here.
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