[OS X TeX] Math mode in TikZ question

[Dietrich, Daniel L]

Hello,

I have a small problem that perplexes me.  I have a document with a  
number of tables that contain math in them (e.g. $\pm 13\: VDC$).   
All works and compiles fine.  I went to add some simple figures using  
TikZ (\usepackage{tikz}) and when I did, I now get an error on any  
table element using '\:' to create a space in math mode ('\,' and  
'\;' work fine).  I can work around it using the other two, but I  
don't know why '\:' gives an error.  I'm not that proficient in LaTeX  
and tikz, so I'm probably missing something simple.

The log file shows the following:

! Argument of \tikz at style@parseB has an extra }.
<inserted text>
                 \par
l.8 		Operating Voltage & $\pm 13\: VDC$ &
                                            Additional requirements  
on ripple...

?
Runaway argument?
VDC$ \unskip \hfil
! Paragraph ended before \tikz at style@parseB was complete.
<to be read again>
                    \par
l.8 		Operating Voltage & $\pm 13\: VDC$ &
                                            Additional requirements  
on ripple...

?
! Extra }, or forgotten $.
<recently read> }

l.8 		Operating Voltage & $\pm 13\: VDC$ &
                                            Additional requirements  
on ripple...

?
! Missing $ inserted.
<inserted text>
                 $
l.8 		Operating Voltage & $\pm 13\: VDC$ &
                                            Additional requirements  
on ripple...

?
! Missing } inserted.
<inserted text>
                 }
l.8 		Operating Voltage & $\pm 13\: VDC$ &
                                            Additional requirements  
on ripple...

?

Thanks in advance,

Dan