got a problem with GS3.0 - cannot save an empty page???

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Try creating manually a test page.
Make a .txt file, rename its extension to xml, edit it and paste below content

Code:

<?xml version="1.0" encoding="UTF-8"?>
<item><pubDate>Mon, 11 Apr 2011 01:01:01 +0100</pubDate><title><![CDATA[testpage]]></title><url><![CDATA[testpage]]></url><meta><![CDATA[]]></meta><metad><![CDATA[]]></metad><menu><![CDATA[testpage]]></menu><menuOrder><![CDATA[5]]></menuOrder><menuStatus><![CDATA[Y]]></menuStatus><template><![CDATA[template.php]]></template><parent><![CDATA[]]></parent><content><![CDATA[testpage]]></content><private><![CDATA[]]></private><sidebar><![CDATA[]]></sidebar></item>

After you save it, upload it to /data/pages directory, go to pages page in your admin panel and see if a page named "testpage" appears, and you can edit it.
Supposing yes, it will give a hint, that there are problems with file creation permissions or file owner.

Tell me exact steps you take to install GS right after you download GS archive.

the testpage try didnt work out for my situation!

i hereby upload the installation of GS3 step by step! everything shows just fine! only when i hit the button save page...