I am very interested in this post as the same has happened with my keyboard!
Has been happening for 6-8 weeks now though I also have no [ as well.
Have tried another keyboard, re-installed Win10, re-installed Titanium, checked my language and region settings, and crawled all over the Web. As yet with no solution
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I also am a little surprised that with some VERY knowledgeable and helpful players on this forum, this issue seems to be unresolved.
Looking forward to hearing from someone and meanwhile the quest will continue.