Nero 5.5.10.0 Problem with VIDEO DVD-R(W)
After "updating" from Version 5.4.19 - wich WAS Ok - DVD is not readable by Standalone Player + unreadable by Power DVD (access only in File Mode) .
Solution : ( after 2 destroyed DVDs )

DISABLE Wizard, Run "neu" - then DVD-ROM ( UDF) - no Multisession - physical Partion+ UDF1.02 - ISO 9660 - burn with 1x1.384KB/s ( try 2x if you want ) - then "NEU Botton" + drag and drop your *.vob Files AND *.IFO AND *BUP Files WITH Directory VIDEO_TS and AUDIO_TS ( inUppercase!) to the "NEU"Disksymbol on the left. Remove a *.lay File if present ( from DVDMaestro).

After that is was OK in my case !

Good luck