**System Information**
Win8.1 64bit | GTX680
**Blender Version**
Broken: 2.71.5 a4c5570
**Short description of error**
According to the [[ http://wiki.blender.org/index.php/Doc:2.4/Manual/Sequencer/Effects#Alpha_Over.2C_Under.2C_and_Over_Drop_Built-in_Effects | Wiki ]] and what I've seen, The results generated by Alpha Under and Over Drop effect strip seems to be inverted to each other.
**Exact steps for others to reproduce the error**
Please open the test blend file to check. Thanks. (images are packed, but need to be reloaded) Tell me if I was wrong or Wiki was wrong, since it has been puzzling me for quite long time. :-}
{F109860}
{F109862}