Option 5 produces "§" instead of infinity symbol. Why?
I have two Macs, both Macbook Pro, mid-2009 with latest OS 10.10.2
On one MBP, but not the other, typing <Option + 5> produces the symbol " § " instead of the infinity symbol.
The last time I typed <Option + 5> to get the infinity symbol it worked, but that was months ago.
I have no idea what I've done to create this issue. I'd really like to get my infinity symbol back!
Any suggestions?
MacBook Pro (17-inch Mid 2009), OS X Yosemite (10.10.2)