Solder Robbers

Altium's 3D board view is an excellent tool for identifying the root cause of soldering related problems.

Example:

The x-ray below shows a pad that has insufficient solder (see mouse pointer).

Lets look at this using Altium's 3D design viewer.

Right away I see a solder robber.  A trace was routed along side a pad, which created a larger area for the solder to flow across.

Fix: 

That's It !