Cleared Cache issue

Was having some issues with WoW, so decided I'd clear my cache/wtf folders. Now, my game is stuck in an endless loop of downloading core game data.

Having mobs/bosses invisible (ie. Odyn wasn't up in ToV) some people in my raid were invisible, lava burst casts were black "orbs" etc.

Anyone experience this before? Should I just let it keep trying to download game data or do a fresh install? The "Scan and Repair" function is not enabled from the battle.net client.

(Disclaimer: At work so can't access battle.net from my PC just want to see if anyone from this sub has had the same problem)