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The genereated .js and .css files have in the template an absolut path:

<link rel="stylesheet" href="C:/XAMPP/htdocs/IkoBB/core//lib/wysibb/theme/default/wbbtheme.css">
<script src="C:/XAMPP/htdocs/IkoBB/module/forum/forum.js"></script>
<script src="C:/XAMPP/htdocs/IkoBB/core//lib/wysibb/jquery.wysibb.js"></script>
<script src="C:/XAMPP/htdocs/IkoBB/module/user/user.js"></script></body>

Since Firefox and Chrome are not allowed to open local files this results in the following errors in the console:

Firefox:
Laden fehlgeschlagen für das <script> mit der Quelle "c:/XAMPP/htdocs/IkoBB/module/forum/forum.js". 1:257:1
Laden fehlgeschlagen für das <script> mit der Quelle "c:/XAMPP/htdocs/IkoBB/core//lib/wysibb/jquery.wysibb.js". 1:258:1
Laden fehlgeschlagen für das <script> mit der Quelle "c:/XAMPP/htdocs/IkoBB/module/user/user.js".

Chrome:
Not allowed to load local resource: file:///C:/XAMPP/htdocs/IkoBB/core//lib/wysibb/theme/default/wbbtheme.css
Not allowed to load local resource: file:///C:/XAMPP/htdocs/IkoBB/module/forum/forum.js
Not allowed to load local resource: file:///C:/XAMPP/htdocs/IkoBB/core//lib/wysibb/jquery.wysibb.js
Not allowed to load local resource: file:///C:/XAMPP/htdocs/IkoBB/module/user/user.js

Furthermore it seems that there is also an issue with the generation of core links: There are two / (= //) after core and before lib.