Latest Activity Gives error

[محروم.كوم]

On our vb5 install (upgraded from vb4.2); we get

invalid_data_requested: array ( 21856 => '21856', 21857 => '21857', 21858 => '21858', 21859 => '21859', 21860 => '21860', 21861 => '21861', )

When using the Latest Activity tab.

You can see it in action here: http://www.diecastmodelaircraft.com/discuss

It also occurs her: http://www.diecastmodelaircraft.com/...raft-community and on other locations.

Ideas? __DEFINE_LIKE_SHARE__