What am I missing when I cannot personalize the Links section of the WorkCenter?

I have designed a GL WorkCenter, and it works great, but users cannot Personalize the Links section by choosing their favorite links.  When they choose a Link, the page just hangs and never returns to the WC.  The process works just fine in the DMO environment, but not in the Test environment.  I think I have all the necessary weblibs and page permissions, but I can't get it to work.  Does anybody know what else to try?

Thanks.