Hi there,
It took me a lot of time but I finally figured out what to do about the background – mainly through trial and error I discovered for my phpBB forum that I could only use a repeating background of the pattern in a jpeg format, so I tried that with the Mandigo theme (using a jpeg instead of png file – just Save As a different file type in MS Paint for example), select that in the Mandigo theme options and hey presto! No stretching!
Hope that helps, and I’ll mark the topic as resolved!
Regards,
keys05