Game freeze near Alexandria - reinforcing army would enter to water)

[llib]

Savegame:
http://www.axifile.com/?4463035
(sorry I did not zipped it)
To reproduce the problem: There are two Seleukid armies to the south-east from Besieged Alexandria, but they cover each other(like it happens sometimes - this time it happened when I tried to maneuver them in position to act as reinforcing army which is often not feasible due to siege graphics of EB - neverthless this is not the problem). Combine them(one army is troops other is just family member), and commence an attack on Ptolemaioi army south-west to lake near Alexandria. They will retreat. Attack the besieging army, set the garrison of Alexandria to manually-controlled reinforcements(other alternatives not tried). You will be able to deploy the troops, when start battle button is pressed, game freezes(or is pathfinding indefinatelly). I guess it can happen that game freezes much later if reinforcements would be delayed, however I can not confirm this now.
EDIT: The game does not crash to desktop(which would lead to "crash to BSOD" on my 64-bit Vistas). It will just freeze.
In case it would be doubtfull, EB version is release 1.0.

EDIT2:fixed typo byt/but
EDIT3:Attacking from port hex after defeating the repelled small army is same problem.