DISABLE / DROP INDEX causing deadlock Rather urgent one.

Have created an index on one of our tables and for some reason all data going into that table has stopped. 

Can't see any blocking, but when I'm trying to drop or disable the index with either

ALTER INDEX [IX_DataCapture_Received] ON [queue].[queued_datacapture_data] DISABLE
DROP INDEX [IX_DataCapture_Received] ON [queue].[queued_datacapture_data] WITH ( ONLINE = OFF, MAXDOP = 1)


I get a report of deadlock preventing it, but nothing is being reported to sp_readerrorlog

Any clues as to what's going on?
Problem solved

Very hacky but got the system back

Set the deadlock priority to high to stop it being auto killed

there are a lot of external apps that access the DB which ended up blocking the drop index (information from the master..sysprocesses table) (but not reporting as blocking through all the checks we have), so I just killed until there was nothing more in its way, dropped straight away

cheers for the quick eyes over