This link’s solution fixed this problem for me.
http://wordpress.org/support/topic/new-post-page-broken-linksmenu-expansion-in-32?replies=27
The post by MikeAmelung towards the bottom of the page has the solution that put me to rights.
-Simon
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My host server had php 5.2 but the JSON extensions were not enabled. Enabling them fixed this issue for me as well.
That seems to be the fix.
Thanks for the solution.
-Simon
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If it weren’t for computers we’d probably be in bed at a decent hour.