The issues section is for bug reports and feature requests only. If you need help, please use stackoverflow.

How to report a bug?

Tell us the revision number of three.js you use.
Try checking your application with the latest dev branch version of three.js (often problems are already fixed there). See migration guide.
Tell us where did you observe the problem: your browser version, your operating system, your graphics card (for example Chrome 23.0.1271.95, Windows 7, Nvidia Quadro 2000M)
If you can, try to check your problem on multiple browsers / multiple computers (if you are on Windows, especially helpful is to compare ANGLE and OpenGL renderers)
Describe the problem in details (what you get instead of what's expected). Saying "it doesn't work" doesn't help much.
Create a small testcase (big chance is when you do this, you'll find the answer yourself).
If small testcase is not possible, at least include a link to online live version of your application.
If your problem creates some visual glitch it helps to include a screenshot (highlight problematic area if problem is subtle).
What did you try already?
Search issue tracker for similar issues. Somebody else may have already filled an issue about your problem (in that case make a comment there instead of creating new issue). Or there may be other issues that seem similar, it helps if you can cross-reference them (mentioned in text hashed issue number like this #1234).