Fixed.

Warning: main(): URL file-access is disabled in the server 
configuration in /var/www-ssl/horde/whups/mybugs.php on line 18

Warning: main(https://xxx.xxx.xx/horde/whups/search.php): failed to 
open stream: no suitable wrapper could be found in 
/var/www-ssl/horde/whups/mybugs.php on line 18

Fatal error: main(): Failed opening required 
'https://xxx.xxx.xxx/horde/whups/search.php' 
(include_path='/var/www-ssl/horde/lib:.:/usr/share/php:/usr/share/pear') in 
/var/www-ssl/horde/whups/mybugs.php on line 18

As you can see, i have a webserver with disabled URL file access. In 
mybugs.php revision 1.36 there was a change from redirect to load of 
search.php. Seems that this change must be done in another way. As a 
fix i used instead of

require Horde::applicationUrl('search.php', true);

following line of code:

require WHUPS_BASE . '/search.php';

But this one is a little bit odd. Would be better to use the function 
applicationUrl. But if i set fullpath to false, than i only get 
'/horde/whups/search.php'. Maybe there is a possibility to use the 
absolute serverpath.