I can confirm the issue (also FF here). Happens also when trying to preview simple text.
This issue (and those below) seems to coincide with the latest forum-adjustments (tapatalk-related?).
Also happening since then:
- "Post reply" page looks somehow ugly (larger font size used for various text, for example the edit box, last 3 posts on that page have lost their proper formatting). I'm using the old theme, if that matters.
- Default forum clock has shifted backwards a few hours.
- When using the new default theme, the "last post" timestamp of the "related topics" is not visible. Not happening when using the old theme.
edit:
added one more issue