I am brazilian, so, sorry for my English :)

If you turn the DEBUG in PHP Debug ON, 3 errors happend in the homepage:
1) Notice [PHP]: Undefined index: modules in file templates_c/db%3Asystem_block_mainmenu.html line 10
If you go to the source of templates_c/db%3Asystem_block_mainmenu.html you find a count((array)$this->_tpl_vars['block']['modules']), and when you enable a module, this error disappear.

2) Notice [PHP]: Undefined index: xoops_lblocks in file class/smarty/Smarty.class.php line 626
I don't know, but I found a @is_array there

3) Notice [PHP]: Undefined index: xoops_module_header in file templates_c/default^theme.html line 35
I don't know this too.

I think that it is a good thing to do to correct this "minor" bugs.

tks...

Those aren't bugs, they're just PHP notices. Turning on debugging shows ALL errors/warnings/notices. A bug would be something returning a Fatal Error, not a warning or notice.

A simple, if($this == $that), and if $that = "" will return a notice of an undefined variable, this happens all the time. This is not a bug.

Please try a search, this topic of notices and warnings has been beaten to death in these forums.