Has anyone run into a problem with vertical text alignment in Outlook '13 when using Stig's bulletproof buttons? I use them a few places in the email with no trouble at all, but in this particular spot the text refuses to vertically align in the center.
How odd! I tried to replicate this issue in a variety of ways but was unable to get the buton text alignment in Outlook 2013 to misbehave.
Could you possibly post your full HTML code, or send it to us at support, so we can investigate more closely and see what's going on there?
I was experiencing a similar issue and was able to work around it by increasing/decreasing the line-height.