Deleting posts from the manage page doesn’t work, but deleting from the edit entry page does work. There are about 10 support threads at Wordpress for this, but no resolution. The ones where it was a rights issue have been figured out, but not the weird behavior of the manage page.
Because the widgets work in the default theme, but not in Tiga, there must be some weirdness with the theme, but I should be able to paste the widget code into sidebar.php in the theme directory.
I don’t think wp-admin/widgets.php works with tiga, because it expects wp-content/plugins/widgets.php. I’ll have to check that soon, and in the mean time, I could probably just paste the code in.
Replacing tiga’s sidebar.php with the default’s works, but the formatting is screwed up. I need to figure out what parts of the default sidebar need to be reproduced in tiga’s.