cant see anything on logged in main webmin page

hello, i have webmin/virtualmin installed. (4 websites installed) I did an update of modules yesterday and it just kept running (circle rotating in the middle of the screen.) I left it go over night and in the morning it had finished. There were quite a few modules which i installed over 3 successive install sessions I logged out. (login page came up) then logged back in, page trys to load for about a minute then when stops, the page is totally blank. Theres no menus, nothing. Im at a loss. obviously one or more modules I updated / installed mustve interferred with the system. Im not 100% sure but I think the last module to install in the last group was webmin/virtualmin (something something)

When i look at the source of the webmin main page it only shows about 20 lines of code. it then stops ... so im assuming something is stopping the page from loading!

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Any ideas greatly appreciated?

Read through various articles but now im just confused and im totally lost.

tried stopping/starting webmin ... did nothing!

var/webmin/miniserv.log ... shows: xxx.xx.xxx.xx - root [23/Jun/2016:16:32:38 +1000] "GET /unauthenticated/css/package.min.css?1782 HTTP/1.1" 200 517910 xxx.xx.xxx.xx - root [23/Jun/2016:16:32:40 +1000] "GET /unauthenticated/js/package.min.js?1782 HTTP/1.1" 200 1086287

var/webmin/miniserv.error ... shows: [xxx.xx.xxx.xx] Document follows : This web server is running in SSL mode. Try the URL https://server.xxxx.com:xxxx/ instead.
but it is logged in using this url already.

Thanks heaps in advance for you help ... I dont really want to have to remove then reinstall webmin/virtualmin & re setup the 4 websites I have already installed. Glen