Official SEx app, version 1.0.35. Android version 4.2.1. When viewing Chemistry SE questions, the tag \ce
is visible and is rendered in red, {aligned}
environment doesn't render at all.
This may be a low priority item since the equations are perfectly visible in Firefox (29.0). However, working inside the app is much more convenient.
A sample Q&A where the bug is manifested: Can water be ignited in an ozone atmosphere?
While I'm at it want to thank the devs for the app. Neat and slim, and really handy.