Drover, can you attach your ModSettings.php file so that I can check the issue?
Felic, for the first question;
../Sources/SPortal.php
Find and Delete:
// Make sure guests can see this board.
$request = db_query("
SELECT ID_BOARD
FROM {$db_prefix}boards
WHERE " . ($board === null ? '' : "ID_BOARD = $board
AND ") . "FIND_IN_SET(-1, memberGroups)
LIMIT 1", __FILE__, __LINE__);
if (mysql_num_rows($request) == 0)
{
die($txt['smf_news_error2']);
}
list ($board) = mysql_fetch_row($request);
mysql_free_result($request);
For the second; I don't there is something wrong with the installer. Maybe UserCP mod makes something unusual. But I'll check it.
For the third; I thought these were better.

I guess you are using a black theme. But I'll change all of them in the next version.
For the last; yes, it doesn't show the posts that the viewer doesn't have permission to see.
[●ριмρєя12●], I hope so. I finished the block functions also. But I'm thinking of adding some new blocks. I hope it will be ready in a week. This version would be like a 2.0 Beta 3 Public version of SimplePortal v1.1 but also some changes made for the further versions.
RustyBarnacle, that sounds good. That means were are going to have a really professional portal for 2.0.
razors edge, you can see them from the mod parser in the mod page. The changes made in the files ending with .template.php.
madman71, are you using a different theme?
iceman~, read the answer for [●ριмρєя12●].
Manu0372, everthing seems okay in the Recent Posts block. Can you show me the problem with some screenshots?
scubaru, now, I'm checking it. Soon I'll give an answer.
And lastly for all of you; apologizes for the delay but I'm a poor university student who doesn't even has his own computer and fighting with the exams these days.//
Edit:For the Arcade Block error;
../Themes/default/SPortal.template.php
Find:
foreach ($best_players as $players)
Add before:
$score_poss = 0;