trouble accessing datastore

[VodkaFish]

Recently I moved my site to new servers. I have the latest versino of vb 3.6.

In the process, I also upgraded from PHP4 to PHP5, and also upgraded to MySQL 5.0.x.

In general, things are going well.

However, I cannot access the datastore like I used to.

I would set something like this:
build_datastore('mystuff', $parsing_cache, 1);

I would then access it like this:
$myvariable = $vbulletin->datastore->registry->mystuff;

However, $vbulletin->datastore->registry->mystuff is empty (and I checked with empty() ).

I look inside my db. mystuff is in the datastore table. The info looks correct.

What can I look for or tweak to access mystuff?