Behavior of qtail on a watched queue

I'm not sure if this is reasonably solvable, but qtail on a queue that another process is polling (using WCF, for what it's worth) dies with the following example message:

> Error: [r2a\private$\wcfzevents] Message that the cursor is currently pointing to has been removed from the queue by another process or by another call to Receive without the use of this cursor.