I recently started using the community version of DNN/

I have downloaded, deployed, installed and then added the wiki module to a page I had created. 

Having added the wiki module and configured it and set up the editing permissions for the wiki, I now have a problem that I am sure I won't be able to resolve easily.

I set up a topic title as WikiHomePage so that I could put some text into the wiki home page - but am struggling with the text content  (can get some in, but not too much). The edit page function of the wiki only shows half a screen - the bottom part is blank. There is an item below the page title with a + sign next to it that opens up a few data entry boxes. If I do that then magically the save and cancel links appear at the bottom of the window underneath the white space - hence I can fill up a bit of the text box and get some text saved on the wiki home page. If I get the text to the bit where the text editing box outline disappears then anything else I type is not visible either so I can't do it properly.

Is this a bug? Is it something else I'm just not familiar with?

Please help!