Can you try using the link provided below to check for any new video drivers? Specifically, check out the post by miklk99 on page 9. This has been known to resolve this issue, as well as fix several other problems with popups:
Blank activation screen
You can also use the FAQ provided below, which should resolve the issue, as most times it's a screen resolution issue:
How do I fix blank screens during activation or in-product purchases in TurboTax Desktop for Windows...
If none of these links work, please click here to try reaching out to customer service during the business hours of 5:00 am to 5:00 pm PT.
@Clement
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