getting
No common formats between any available portfolio plugin and the calling location forum_portfolio_caller

    * line 240 of lib/portfoliolib.php: call to debugging()
    * line 3481 of mod/forum/lib.php: call to portfolio_add_button->to_html()
    * line 5815 of mod/forum/lib.php: call to forum_print_post()
    * line 239 of mod/forum/discuss.php: call to forum_print_discussion()

when only picasa enabled in forum posts - I suppose it would be better to show this as a real warning on configuration pages instead of debug info in each forum post