I am running the web-demo example with the REST interface, and it seems I can only receive every other posted messages. Here are the simple scripts I used to do the test:
Do you use a single broker are have you (maybe accidentally due to auto-discovery) configured a network of brokers? We've had the same behaviour using the ant producer/consumer with a network of brokers (see configuration pitfall under the network of broker wiki-page). Greetz Mario