[Update - V7 is now available, with the fix and tested on iOS4]
Something changed in the Netflix API, and some API calls are now failing to go through, while others are working. For IQ+ the effect is that it can't read the queue.
The problem is due to a change in the Netflix API implementation that exposed a bug in IQ+, an updated version has been posted to the AppStore approval process.
Apologies for the inconvenience.