Tested with BB Priest on a linux build:

 

[Description of the issue]
For tested abilities (see below), which operate on a longer than close-range distance, there is an inconsistent behaviour of the character AI (an actual movement) in comparison to the spellcasting cursor change to contain a footprint (to indicate a need of movement).

-> So the character can actually fire a spell on a slightly larger distance than the cursor indicates.

 
[DETAILED list of steps to reproduce the issue AND what to look for]

1) Choose a BB Priest and some distance spell;
tested spells:
-- AoE spells: Instill Doubth, Divine Terror, Restore Light Endurance
-- single target: Divine Mark, Halt, Barbs of Condemnation

2) Point a targeting cursor barely on/over the edge of the spell distance (just where the cursor changes to contain a footprint);

3) Activate the spell;

4) And observe that the character didn't need to move from the original spot to fire the spell, despite of the icon indication...
 

 

 

[Other remarks / Comments]

Probably bug in the icon change?

 

May be related to these issues:

http://forums.obsidian.net/topic/69700-364-perception-and-spell-range-indicators/

http://forums.obsidian.net/topic/68536-wizard-running-to-point-blank-range-to-cast-spellsrange-icon-incorrect/?hl=distance&do=findComment&comment=1511154

 

Althrough, I can reproduce it consistently.

Thanks for your feedback. This is a known issue.