Because Lauren helped me with my texture purchase issue (see! customer service does pay off!), I searched around and finally found this bug in Jira. It is VWR-2327. I inserted a comment pointing to this thread, but someone who is repeatably experiencing this should edit the bug description to describe the cursor issue in more detail.
Also, if you are concerned about this you should vote for the issue. Please ignore the instructions below if you already know how to use Jira.
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The JIRA login page is at
https://jira.secondlife.com/cas/login?service=https%3A%2F%2Fjira.secondlife.com%2F secure%2FDashboard.jspa-- If you know the bug number (like VWR-2327), then enter it in the "Quick Search" field in the upper right of the JIRA screen.
-- When the bug description comes up, look on the panel on the left side of the screen for the section called "Operations" (probably the last section)
-- The last item in that section should be "Voting". A single click there will register your vote. The page will change to indicate that you now have voted for this bug.
ALL DONE!
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The next time you log into Jira, you will see a set of links on the entry page like this:
"My Unresolved Reported Issues | Votes "
Click on the "Votes" part of the link and you will see the status of all issues you have voted for.
Also, whenever you're looking at a bug description, in the far left panel you will see a line titled "Votes". This is the number of people who have voted for the issue, and if you click "View" there you can see their names. So you can IM your friends who haven't yet voted to do so