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Mathematica 5.1 JLink problem


I've recently installed Mathematica 5.1 on a Mac OS X box (running 
Panther 10.3.7).  After copying the Mathematica 5.1.app bundle to 
/Applications/ as the Administrator, then switching back to my ordinary 
user account, I found that JLink could not be started.  Evaluating 
(from a fresh kernel session)

	Needs["JLink`"];
	InstallJava[];

Gives, as error messages,

	InstallJava::uifail:
	The separate Java user-interface link could not be established.

	InstallJava::fail:
	A link to the Java runtime could not be established.

However, if I evaluate the above when logged in as Administrator, JLink 
starts just fine.  JLink under Mathematica 5.0 (which I still have 
installed as well) works just fine from my ordinary user account.

Any guesses as to what might be wrong?

Cheers,

Jason


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