The German III Corps offensive, specifically what happened to XI Corps is one of my pet projects.
http://forum.juhlin.com/showthread.php?t=354 has a long and detailed discussion.
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The XI Corp is cut off from friendly forces not so much by the Soviets as by the terrain – the Oder river and numerous interconnected lakes form a water barrier from Szczecin to the Baltic. The Corp is still in contact by sea with Germany, but any move to rejoin allied forces would require an offensive against Pact divisions to the south and east of the irradiated ruins of Szczecin. Some supply is possible by available shipping, but there is not enough capacity remaining after the spring debacle to withdraw even a small part of the Corp. Port facilities are likewise limited with most supplies having to be brought directly onto the beaches by small boat.
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My comments reposted above are about the most logical explaination I've been able to come up with - terrain is the main enemy although some Pact presence in the form of patrols (in addition to the lack of necessary equipment and materials) prohibits XI Corp from trying to rebuild crossing points.
Individuals and small units (up to say plattoon size) can be transfered back and forth by sea, but to evacuate the Corps would require many months and the abandonment of
all heavy equipment (anything that can't be manhandled onto a small boat).
Travel by land would require a unit to push south as far as Berlin (perhaps even beyond) and almost certainly into contact with hostile forces. XI Corp also doesn't have the fuel, nor ammunition required to mount any sort of serious offensive action to clear their path.