I asked a question which was answered quite nicely: How to calculate the local factor at the infinite place of a function field? but I wanted to post a follow up answer with an explicit calculation, in case anyone was interested (and also to mention an error in a frequently used text).
However, when trying to "answer my own question", I see that the math formulas (or in fact, any formatting) is not rendering in the preview box. I tried to answer a different own question, and replicated the behavior.
On the other hand, I can answer other people's questions normally, so this is a phenomenon that only happens when answering own questions.
I should also mention that I answered my own question a few weeks ago, without any problem like this.