Despite leading 17-10 at the break the Athlone club left Limerick pointless on Saturday.
Buccaneers endured a difficult day out against Garryowen on Saturday.
The game's kick off was delayed to enable the club's players attend the funeral mass of Pat Byrne, Head Coach Paul Byrne's father.
James Kelly's early try set Buccs up nicely in the game, and after Stephen Mannion extended their lead to 17-10 it looked like an unlikely win was on the cards.
The second period that began with errors ultimately led to a pointless defeat, on a final scoreline of 33-17.
Buccaneers are next out against Naas this weekend.