Usergroup fonts ?

[psxnet]

Recently, and for no apparent reason, I.E. I have not changed or added anything to the forum in any way, all the user titles have reverted to what I presume must be a standard font that looks like Times New Roman 8

In usergroup manager I have an entry for each group under Username HTML Markup, similar to the following:

<span style="font: 16px aeriel;color: purple;">

and this has always worked fine for years.
The colour is still fine, it's just the font and the size that have stopped working !, so any ideas what may have gone wrong please folks ?

Running 3.7.0 beta 3

Thanks.