I just debugged a client website who was using your plugin and I found that you are using
$wp_rewrite->flush_rules(); in an
'init' hook; this is a MAJOR BAD PRACTICE and your plugin should be fixed before anyone should consider using it on any website with more than a few pages.
The problem is line 336 of
TA_multi_toolkit.php; this needs to be done in a register_activation hook, NOT an init hook:
FYI, this just cost the client US$300 to debug this problem. Bugs cost money. Fix it so the next user isn't screwed in the same way.