Today I tested 1.50rc, and I found a (probably new) animation bug:
If you have a pistol and a primary weapon equipped, switching from the lowered pistol to the primary weapon makes your character perform (kind of) these movements:

1. pull the pistol from the holster and point straight ahead
2. lower the pistol
3. put away the pistol and take your primary weapon

As the pistol was out of the holster and lowered already, the first two animation phases should be skipped.