I just found this post, but since it is nearly 2 years old I hope you get my message.
I bought a Panasonic DMR-EZ28 around 6-8 years ago.
It was brand new from a big name retailer.
I never really needed it, so it just sat there.
Then about a month ago I decided to hook it up.
It worked for only 2 weeks of light use.
Now I get the message, "This disc is incompatible"
I use high quality Verbatim DVD+RW discs.
When I got the message I tried another DVD+RW disc and a DVD+R disc also.
I still get the same message.
Please let me know how to contact you for a possible repair.