Wikimedia Bugzilla is closed!

The math formula used in [[Watt]] works on en.wikipedia but where I've checked
(meta, nn, fr) a failure message is shown (Failed to parse (PNG conversion
failed; check for correct installation of latex, dvips, gs, and convert): \mbox{
W} = \frac{\mbox{J}} {\mbox{s}} = \frac{\mbox{N·m}} {\mbox{s}} =
\frac{\mbox{kg·m}^2} {\mbox{s}^3} = \mbox{ V·A})

Other formulas seems to be working fine, I've put up to test examples at:
http://meta.wikimedia.org/wiki/User:Dittaeva/sandbox
http://en.wikipedia.org/wiki/User:Dittaeva/Sandbox
to show the difference.