Cursor problems in the Client

In the client (not during games), I've been having an issue where my cursor will become the double-arrow that normally happens when you hover the cursor over the side of a window, and signifies that you can click and drag to expand or shrink the window. Only this is happening when the cursor never went near the edge. The problem fixes itself when I hover the cursor over the edge of the client window. Anyone else getting this?
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