I cannot help you with a fix to this problem, but I do have a bit of advice.
It is worth bearing in mind that Helvetica is a poor choice of font for a website in the first place. It is not one of the fonts included with Windows-based PCs (Arial is the closest equivalent), and it has long been regarded as a font that, while excellent for print, it does not work well on the screen.
Simon Jessey | Keystone Websites
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