I'm using TeXShop 2.43 on Mac OSX 10.6.8 and one of the latest LaTeX releases (I ran an update a few weeks back). My long implication arrows have a dot on either the top or bottom line (see attached photo). It happens with
\Longleftarrow. The shorter arrows don't have it. It happens with all fonts sizes.
Is this a known issue? I googled it and I looked for it here, but I came up with nothing. Perhaps it's something with my system or version of LaTeX? On TeXShop under Preferences - Typesetting it says the default script is PDFTeX.
I'm sorry if I'm not supplying enough info here, I'm not very behind-the-scenes TeX savvy.