I'm seeing the same thing … "No <insertdesigntypehere> elements available to you." WindowsXP, Domino 6.5.2 Server, MSXML SP2. DXLPeek installed in the DXLPeek_0_38 subdir off the root to Data.
When I click on something like "Forms", which I know there are many of in this one particular DB, I can hear the server churning like crazy, the "Loading Elements …" message shows in the status bar, and then the message above is displayed. However, I just click on the grey DB banner/ icon, I do get all the database details.
The following gets logged to the AgentLog (as 2 documents):
DXLService(): Starting at: Thu Sep 30 16:09:25 EDT 2004<br/>
DXLService(): url request: openagent&file=dxlpeek_0_38DXLPeek.nsf&request=elements&type=form<br/>
I have full rights to the server, and all the DB's on it. I even added your design ID, Developer DXLPeek/S3Consulting, to a few of the agent execution lists, just to be sure.
I get the same results for even modestly designed DB's.
If there's any additional help I can offer, e-mail me at sean.heffernan at gmail.com or post here. - S