Tested from another computer and same problems. But, possibly this is the problem;
I noted in the DW fie bar on the page that is using the theme that it looks to be looking for the same page as is themed. For instance:
$WA_testFW_1286035464517_Template = new WA_Include("Templates{$WA_testFW_1286035464517_Content_Empty}/testFW.php");
"testFW.php" is the same name as the page that is themed... Plus it's looking for a file that does not exist on that path.
A change to target the original template makes my test page now load:
$WA_testFW_1286035464517_Template = new WA_Include("Templates/testTemplate.dwt.php");
I've yet to test the pages created yesterday on my laptop but that is the next step...