User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.5; en-US; rv:1.9b3pre) Gecko/2008012701 SeaMonkey/2.0a1pre Build Identifier: Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.5; en-US; rv:1.9b3pre) Gecko/2008012701 SeaMonkey/2.0a1pre With latest nightly and STIX fonts installed, <msqrt> stretches horizontally, but not vertically. Reproducible: Always Steps to Reproduce: 1. Load test case Actual Results: Square root encloses only first line. Expected Results: Square root should enclose entire fraction.
Do you have a "user set" preference for "font.mathfont-family" in about:config? If so, try reseting to default (context menu -> Reset).
Ah! That preference is imported, by default, from whatever previous version was installed. Resetting it to the default fixes both this bug and bug 414294.