Flygal -
Did you buy AIOCF or AVO.TO? The daily liquidity is vastly different between the two (9,000 vs 500,000 shares traded today 8/14, respectively). I opened a Schwab account last month specifically for the ability to execute under the AVO.TO ticker. I then spoke to two different Schwab traders telling me that the share I bought under either ticker was the same. I paid an extra $25 in commission to override their trading system and guarantee the AVO.TO purchase.
Not that it matters now but it sounds like you have some AIOCF. While it trades in near lockstep with AVO.TO it is less liquid and thus your frustration.
Eric