Thank's all for your suggestions. It finally occurred to me to try it on my desktop computer instead of my notebook, and IT WORKED!! Don't ask me to explain, because I thought the two computers were set up identically. Oh well, these computers are just a passing fancy.
On another subject. I was delighted to find this forum, because even though I've not owned a C-Dory (don't forget, I'm a rag sailor), I've had a bit of exposure to the brand. For about 10 years I worked part time at Scan Marine in Seattle, and C-Dory was one of our largest customers for the Wallace diesel cook top range. A great product installed in a great boat.
Don Haff
Rag boat sailor