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Thanks for all the suggestions here guys. I had tried all of them already though

. I've built a few XOOPS sites now and experienced (or suffered) the white page issue a few times, and knew many of the troubleshooting suggestions. This is why I was so very stumped.
However, having said all of that, I don't think it was anything to do with the theme itself because I tried with another theme and I had the same problem.
In the end, I logged into my server via ActiveX controls and edited the theme.html file physically on the server rather than uploading it. That generally seemed to work, although, bizarrly, on one or two occasions it happened again but I think that was me getting code wrong!
In addition, some hours later, I started to get problems uploading a gif. The file was there, but when viewed (even via the ActivX log in session) the file was empty. Very odd. I fixed that by logging off the server, rebooting my own laptop! Then it was fine.
Basically I think the problem is related to the FTP connection somewhere. I have a WPA encrypted wireless connection going to a router that is then encrypted with sFTP to the server. I suspect that somehwhere along the line something is getting corrupted. Brashquido and I (who share the VPS itself) may need to get our heads together when he gets back from his globe trotting adventures!
In summary, I don't think it has anything to do with the fine theme developed by Snow and his merry men. Apologies if it came across that way, but at first, that is how it seemed to me before I was aware of the other potential problem with the FTP.
Thanks again folks
Regards
Ted