WowAce

What version of Grid2  are you using (Version is displayed in General/About Tab) ?
v2.0.68

What game client version, classic or retail, windows or mac and language are you using ?

 Windows 10, retail, version 10.0.2.46702

What steps will reproduce the problem?

Select the 28 range status for range indication, then try to heal someone who is a few steps out of range as shown by the indicator.
Other healing addons like vuhdo display the range perfectly for evoker, so it seems to be possible to display it correctly. 
  
Did you try having Grid2 as the only enabled addon and everything else disabled?

 no

Was it working in a previous version? If yes, which was the last good one?

 didnt check

Thanks in advance.  

Update to version 2.0.69-beta and configure "Heal" range, now this option uses the evoker living flame spell (25 yards) to check the range.

Thanks for the swift response. The healing evoker spec has a 30 yard range though, the 25 yards is only for the dmg spec.
For the healing evoker the living flame has 30 yards range tho, while for the dmg evoker it has 25 yard range. So it should work. 

Tyvm

Edit: Just checked. it works now :)