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Ok I figured out that the PHP notice "XoopsUser could not be converted to int" can be ignored.
However, I did some digging in the wiwimod code and made the following change to get the myblocksadmin.php page to show:
Replaced
// get blocks owned by the module
$block_arr =& XoopsBlock::getByModule( $xoopsModule->mid() ) ;
With
$block_handler = &xoops_gethandler('block');
$block_arr =& $block_handler->getByModule($xoopsModule->mid()) ;
Looks like wiwimod is trying to call getByModule without instantiating a proper XoopsBlock object. Hopefully this change is ok. At least I can see the rest of the page now. However, I don't think this solves my root problem of not being able to create a new wiki page.
I'll post a message at
http://www.zonatim.com to see if I can get some more help.