[Unity 4.6.2] Odd intermittent Raycast Bug?

Getting a really odd raycast bug, it looks as though the cast works then when the player moves the cast fails?

PS. Raised a Bug Report 669611

But wondering if anyone else has bumped into this problem and solved it (pun intended)?

 

OK I was using a turn based mechanic and the characters would move when triggered in Update() by player input. This would then call the enemy players to move and then do a LOS / raycast test.

Now sometimes the test was working and sometimes it was failing.

But moving the LOS test to the next frame fixed it.

ODD bug???