I have noticed that the allin EV is not correct if one player is all in and other players are not all in.
Example:
<html><head><title>Hand converted with Elephant 0.69 by PokerStrategy.com</title></head><body><font style="font-family: Tahoma;"> <a href="edit:commentGeneral">(Comment)</a><br /><b>Known players:</b> (<a href="http://www.pokerstrategy.com/en/articles/182/?referer=grabem_hand">?</a>)<br /><table><tr><td><table><tr><td align=left width='25px'><font size=-1>vp$ip</font></td><td align=center width='25px'><font size=-1>BBvsSteal</font></td><td align=center width='25px'><font size=-1>ORL</font></td><td align=right width='25px'><font size=-1>RaisePreflop</font></td></tr><tr><td colspan=4 align=center style='border-style:solid; border-width:thin; border-color: #000000'><b>Position</b>: Stack</td></tr><tr><td align=left width='25px'><font size=-1>AF</font></td><td align=center width='25px'><font size=-1>W$SD</font></td><td align=center width='25px'><font size=-1>WTS</font></td><td align=right width='25px'><font size=-1>hands</font></td></tr></table></td><td width=35px></td><td><table><tr><td align=left width='25px'><font size=-1></font></td><td align=center width='25px'><font size=-1></font></td><td align=center width='25px'><font size=-1></font></td><td align=right width='25px'><font size=-1></font></td></tr><tr><td colspan=4 align=center style='border-style:solid; border-width:thin; border-color: #000000'><b>Hero</b>: $3.35</td></tr><tr><td align=left width='25px'><font size=-1></font></td><td align=center width='25px'><font size=-1></font></td><td align=center width='25px'><font size=-1></font></td><td align=right width='25px'><font size=-1></font></td></tr></table></td><td width=35px></td><td><table><tr><td align=left width='25px'><font size=-1>27 </font></td><td align=center width='25px'><font size=-1>100 </font></td><td align=center width='25px'><font size=-1>33 </font></td><td align=right width='25px'><font size=-1>18 </font></td></tr><tr><td colspan=4 align=center style='border-style:solid; border-width:thin; border-color: #000000'><b>MP1</b>: $13.20</td></tr><tr><td align=left width='25px'><font size=-1>2.6</font></td><td align=center width='25px'><font size=-1>100 </font></td><td align=center width='25px'><font size=-1>13 </font></td><td align=right width='25px'><font size=-1>62</font></td></tr></table></td><td width=35px></td><td><table><tr><td align=left width='25px'><font size=-1>36 </font></td><td align=center width='25px'><font size=-1>-</font></td><td align=center width='25px'><font size=-1>0 </font></td><td align=right width='25px'><font size=-1>17 </font></td></tr><tr><td colspan=4 align=center style='border-style:solid; border-width:thin; border-color: #000000'><b>CO</b>: $10.00</td></tr><tr><td align=left width='25px'><font size=-1>2.9</font></td><td align=center width='25px'><font size=-1>63 </font></td><td align=center width='25px'><font size=-1>40 </font></td><td align=right width='25px'><font size=-1>58</font></td></tr></table></td><td width=35px></td></tr></table><br /><b> 0.1/0.25 No-Limit Hold'em <font color=#0000cc>(9 handed)</font></b><br /><i><font size=-1>Hand recorder used for this <a href="http://www.pokerstrategy.com/en/about/?referer=grabem_hand">poker</a> hand: <a href="http://www.pokerstrategy.com/en/about/?referer=grabem_hand">Elephant 0.69</a> by <a href="http://www.pokerstrategy.com/en/about/?referer=grabem_hand">www.pokerstrategy.com</a>.</font></i><br /><br /><b>Preflop:</b> Hero is SB with A<img src="http://www.pokerstrategy.com/smilies/spade.png">, Q<img src="http://www.pokerstrategy.com/smilies/heart.png"> <a href="edit:commentPreflop">(Comment)</a><br /><i><font color=#a0a0a0>2 folds</font></i>, <font color=red>MP1 raises to $0.50</font>, <i><font color=#a0a0a0>2 folds</font></i>, CO calls $0.50, <i><font color=#a0a0a0>BU folds</font></i>, <font color=red>Hero raises to $3.35 (All-In)</font>, <i><font color=#a0a0a0>BB folds</font></i>, MP1 calls $2.85, CO calls $2.85.<br /><br /><b>Flop:</b> ($10.30) Q<img src="http://www.pokerstrategy.com/smilies/diamond.png">, A<img src="http://www.pokerstrategy.com/smilies/heart.png">, K<img src="http://www.pokerstrategy.com/smilies/club.png"> <font color=#0000cc>(2 players)</font> <a href="edit:commentFlop">(Comment)</a><br />MP1 checks, <font color=red>CO bets $1.00</font>, MP1 calls $1.00.<br /><br /><b>Turn:</b> ($12.30) K<img src="http://www.pokerstrategy.com/smilies/heart.png"> <font color=#0000cc>(2 players)</font> <a href="edit:commentTurn">(Comment)</a><br />MP1 checks, <font color=red>CO bets $1.50</font>, MP1 calls $1.50.<br /><br /><b>River:</b> ($15.30) 6<img src="http://www.pokerstrategy.com/smilies/heart.png"> <font color=#0000cc>(3 players)</font> <a href="edit:commentRiver">(Comment)</a><br />MP1 checks, <font color=red>CO bets $4.15 (All-In)</font>, MP1 calls $4.15.<br /><br /><b>Final Pot:</b> $23.60<br /><br /><b>Results follow (highlight to see):</b><br />Hero shows two pairs, aces and kings (As Qh)<br />MP1 shows a full-house, sixes full of kings (6d 6c)<br />CO shows a straight, ace high (Td Jc)<br /><br />MP1 wins with a full-house, sixes full of kings (6d 6c)<br /><br /> <a href="edit:commentEnd">(Comment)</a></font></body></html>
In this hand you can see that the hero is allin preflop. The chance of winning is 36.5% so the Allin EV should be roughly breakeven (slightly positive) however the calculated Allin EV is the value where the chance of winning is 0% (as if hero wasn't all in before the river)
This only seems to be the case in situations where other players are not Allin.
Edit: Not sure if this really counts as a "Bug" as such.