I found the following bug report at en.wikipedia.org/wiki/Wikipedia_talk:Special:Preferences#MathML_bad_default.
MathML is the default for the format delivered to the browser. My browser does not support MathML. A month ago, I saw formulas. > Today, I see absolutely nothing.
I saw the notices that at least two discussions were "closed", and should not be edited, and that further comments should be directed to the "appropriate discussion page". If this is not that page, please advise.
Those discussions seemed to end with the decision not to change the default rendering technique, yet I am suddenly unable to view any formula without logging in.
(I am using the stock browser on a Nook Tablet. I have not tried on a real computer.)
I don't have a Nook Tablet, so I can't test it myself. I requested a screenshot (with info on how to post it), but if there is anything else you need, please tell me and I will ask for it.
Here is some more information. I find it quite odd that nothing is displayed at all not even a fallback image.
It works fine in Firefox 27 and in Internet Explorer 10. (A variety of posts had suggested that MathML was not supported in most browsers.)
I don't think there's any way to post a screen shot of a Nook Tablet, short of finding a digital camera. If you can take my word for it, on a real computer the first formula in the article "Russell's paradox" looks like:...Symbolically: <perfectly good looking formula>
while on the Nook Tablet, what I see is:...Symbolically:
That's it, nothing displays between "Symbolically:" and the next paragraph of text.
I appreciate your showing an interest in this. Let me know if you think it would help for me to go to this "Phabricator".