InDesign performance issue: New document window gives blank screen
Latest version of InDesign supplied by Creative Cloud installer on 64-bit Windows 10 PC.
Steps to reproduce:
1. File - New Document.
2. Bingo...
Expected result:
A useful window with options to create a new document.
Actual result:
A useless blank screen (see attached screenshot).

Hello All,
Thank you for reporting the issue to us.
We have fixed the issue in the latest version of InDesign, Id 15.0
Please upgrade your InDesign application to the latest version to try out the fix.
If you face any problems with the new update, do let us know in the comments.
You may also follow the below given link for the list of all fixed issues in Id 15.0
https://helpx.adobe.com/indesign/kb/fixed-issues.html
-InDesign Team
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Raphaël Freeman commented
After closing InDesign (or it crashes), reopening renders ALL dialogue boxes as blank. This has not been resolved in the latest update 207 (windows 10 64 bit).
The only solution is keep reinstalling the patch.
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ben commented
My File > New document shows no dialog box at all. Its hidden somewhere and no matter how i try to resolve, the iss ue still remains