From CoC forum:
11.4.2014 Maintenance Break – Clan Wars Scouting bug
Get ready, maintenance coming soon!! This will fix the inability to scout the War Map that is affecting most players. The other ongoing issues (not being able to collect resources, clear obstacles, etc) are happening also a consequence of this bug so we’re expecting most of it to be solved as well.
Please keep sending us your feedback if you notice something irregular after the maintenance’s over! This should last about 30 minutes.