Recording Dvd-r On Panasonic E100h

Has anyone else had the problem of recording a DVD-r on this machine and then finding nobody else can read it on their players ?
And DVDs recorded on other machines will not read on mine…
In every other regard this is a brilliant machine and mostly we use the hard drive but it is frustrating when a relatives’ digital pictures have been recorded onto a DVD and then we are unable to view them. :confused: