Yesterday I was sending resources to a clanmate, but using the slider I couldn't enter the exact amount I wanted to send so I typed the figure into the right-hand box. When I clicked send, no resources were debited from my stock, although a caravan was sent. When the caravan returned a message that no resources could be sent was received.

Using the slider to input an amount worked fine - I just couldn't send the amount I wanted. While this doesn't cause any problems with game-play, it is still a bug as either method of entering the amount of resources you want to send should be okay.